21a+7-2a=-12

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Solution for 21a+7-2a=-12 equation: 



21a+7-2a=-12

We move all terms to the left:

21a+7-2a-(-12)=0

We add all the numbers together, and all the variables

19a+19=0

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

19a=-19

a=-19/19

a=-1

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