-6a=-21

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Solution for -6a=-21 equation: 



-6a=-21

We move all terms to the left:

-6a-(-21)=0

We add all the numbers together, and all the variables

-6a+21=0

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

-6a=-21

a=-21/-6

a=3+1/2

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