-a+1-8=-15

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Solution for -a+1-8=-15 equation: 



-a+1-8=-15

We move all terms to the left:

-a+1-8-(-15)=0

We add all the numbers together, and all the variables

-1a+8=0

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

-a=-8

a=-8/-1

a=+8

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