7a-2+8=-1

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Solution for 7a-2+8=-1 equation: 



7a-2+8=-1

We move all terms to the left:

7a-2+8-(-1)=0

We add all the numbers together, and all the variables

7a+7=0

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

7a=-7

a=-7/7

a=-1

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