-7a-12=21

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Solution for -7a-12=21 equation: 



-7a-12=21

We move all terms to the left:

-7a-12-(21)=0

We add all the numbers together, and all the variables

-7a-33=0

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

-7a=33

a=33/-7

a=-4+5/7

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