87=8a-9

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Solution for 87=8a-9 equation: 



87=8a-9

We move all terms to the left:

87-(8a-9)=0

We get rid of parentheses

-8a+9+87=0

We add all the numbers together, and all the variables

-8a+96=0

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

-8a=-96

a=-96/-8

a=+12

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