Answer :

Combine like terms so add 4b and 15b together and add 7 and 3 together and then the answer would be 19b-10
4b-7-15b+3

=-11b-4

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Explanation:

4b = b+b+b+b

15b = b+b+b+b+b+b+b+b+b+b+b+b+b+b+b

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So...

4b-15b

=(b+b+b+b)-(b+b+b+b+b+b+b+b+b+b+b+b+b+b+b)

=b+b+b+b-b-b-b-b-b-b-b-b-b-b-b-b-b-b-b

=-b-b-b-b-b-b-b-b-b-b-b=-11b

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-7 = -1-1-1-1-1-1-1

3=1+1+1

-7+3=(-1-1-1-1-1-1-1)+(1+1+1)

=-1-1-1-1-1-1-1+1+1+1=-1-1-1-1=-4

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