1.
Since 5x contains the variable to solve for, move it to the left-hand side of the equation by subtracting 5x from both sides.
3x−7−5x=13
Add 3x and −5x to get −2x.
−2x−7=13
Move -7 to the right hand side of the equation.
−2x=7+13
Add 7 and 13 to get 20.
−2x=20
Divide each term in the equation by −2.
x=−10
2.
Since 5x contains the variable to solve for, move it to the left-hand side of the equation by subtracting 5x from both sides.
7−3x−5x=13
Add −3x and −5x to get −8x.
7−8x=13
Move 7 to the right hand side of the equation.
−8x=−7+13
Add −7 and 13 to get 6.
−8x=6
Divide each term in the equation by −8.
x=−3/4
