21a=(-7)

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Solution for 21a=(-7) equation: 



21a=(-7)

We move all terms to the left:

21a-((-7))=0

We add all the numbers together, and all the variables

21a+7=0

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

21a=-7

a=-7/21

a=-1/3

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