8-7a=57

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Solution for 8-7a=57 equation: 



8-7a=57

We move all terms to the left:

8-7a-(57)=0

We add all the numbers together, and all the variables

-7a-49=0

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

-7a=49

a=49/-7

a=-7

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