87=9+6a

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Solution for 87=9+6a equation: 



87=9+6a

We move all terms to the left:

87-(9+6a)=0

We add all the numbers together, and all the variables

-(6a+9)+87=0

We get rid of parentheses

-6a-9+87=0

We add all the numbers together, and all the variables

-6a+78=0

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

-6a=-78

a=-78/-6

a=+13

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