-3a=-87

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Solution for -3a=-87 equation: 



-3a=-87

We move all terms to the left:

-3a-(-87)=0

We add all the numbers together, and all the variables

-3a+87=0

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

-3a=-87

a=-87/-3

a=+29

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