15a-13=16a+7

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Solution for 15a-13=16a+7 equation: 



15a-13=16a+7

We move all terms to the left:

15a-13-(16a+7)=0

We get rid of parentheses

15a-16a-7-13=0

We add all the numbers together, and all the variables

-1a-20=0

We move all terms containing a to the left, all other terms to the right

-a=20

a=20/-1

a=-20

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