Solve each of the following equations. Be sure to check your solutions.

a. [tex]4(x-1)-2(3x+5)=-3x-1[/tex]

b. [tex]3x-5=2.5x+3-(x-)[/tex]



Answer :

Sure, let's solve each equation step-by-step and check the solutions.

### Part (a): Solve [tex]\( 4(x-1) - 2(3x + 5) = -3x - 1 \)[/tex]

1. Distribute the coefficients on the left-hand side:
[tex]\[ 4(x-1) - 2(3x+5) = 4x - 4 - 6x - 10 \][/tex]

2. Simplify the left-hand side by combining like terms:
[tex]\[ 4x - 4 - 6x - 10 = -2x - 14 \][/tex]

3. Write the equation with the simplified left-hand side:
[tex]\[ -2x - 14 = -3x - 1 \][/tex]

4. Add [tex]\(3x\)[/tex] to both sides to start isolating [tex]\(x\)[/tex]:
[tex]\[ -2x + 3x - 14 = -1 \][/tex]
[tex]\[ x - 14 = -1 \][/tex]

5. Add 14 to both sides to completely isolate [tex]\(x\)[/tex]:
[tex]\[ x - 14 + 14 = -1 + 14 \][/tex]
[tex]\[ x = 13 \][/tex]

6. Check the solution by substituting [tex]\(x = 13\)[/tex] back into the original equation:
[tex]\[ 4(13-1) - 2(3 \cdot 13 + 5) = -3 \cdot 13 - 1 \][/tex]
[tex]\[ 4 \cdot 12 - 2 \cdot 44 = -39 - 1 \][/tex]
[tex]\[ 48 - 88 = -40 \][/tex]
[tex]\[ -40 = -40 \][/tex]
The solution [tex]\(x = 13\)[/tex] checks out.

### Part (b): Solve [tex]\( 3x - 5 = 2.5x + 3 - x \)[/tex]

1. Combine like terms on the right-hand side:
[tex]\[ 2.5x + 3 - x = 1.5x + 3 \][/tex]

2. Write the equation with the simplified right-hand side:
[tex]\[ 3x - 5 = 1.5x + 3 \][/tex]

3. Subtract [tex]\(1.5x\)[/tex] from both sides to start isolating [tex]\(x\)[/tex]:
[tex]\[ 3x - 1.5x - 5 = 3 \][/tex]
[tex]\[ 1.5x - 5 = 3 \][/tex]

4. Add 5 to both sides to isolate [tex]\(1.5x\)[/tex]:
[tex]\[ 1.5x - 5 + 5 = 3 + 5 \][/tex]
[tex]\[ 1.5x = 8 \][/tex]

5. Divide both sides by [tex]\(1.5\)[/tex] to solve for [tex]\(x\)[/tex]:
[tex]\[ x = \frac{8}{1.5} \][/tex]
[tex]\[ x \approx 5.3333 \][/tex]

6. Check the solution by substituting [tex]\(x = 5.3333\)[/tex] back into the original equation:
[tex]\[ 3(5.3333) - 5 = 2.5(5.3333) + 3 - (5.3333) \][/tex]
[tex]\[ 15.9999 - 5 = 13.3333 + 3 - 5.3333 \][/tex]
[tex]\[ 10.9999 \approx 10.9999 \][/tex]
The solution [tex]\(x \approx 5.3333\)[/tex] checks out.

### Final Answers:
- Part (a): [tex]\( x = 13 \)[/tex]
- Part (b): [tex]\( x \approx 5.3333 \)[/tex]