8a+7a=-15

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



8a+7a=-15

We move all terms to the left:

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

We add all the numbers together, and all the variables

15a+15=0

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

15a=-15

a=-15/15

a=-1

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