-4a=-84

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Solution for -4a=-84 equation: 



-4a=-84

We move all terms to the left:

-4a-(-84)=0

We add all the numbers together, and all the variables

-4a+84=0

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

-4a=-84

a=-84/-4

a=+21

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