15-7a=-9a+8

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Solution for 15-7a=-9a+8 equation: 



15-7a=-9a+8

We move all terms to the left:

15-7a-(-9a+8)=0

We get rid of parentheses

-7a+9a-8+15=0

We add all the numbers together, and all the variables

2a+7=0

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

2a=-7

a=-7/2

a=-3+1/2

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