21a=56+7

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Solution for 21a=56+7 equation: 



21a=56+7

We move all terms to the left:

21a-(56+7)=0

We add all the numbers together, and all the variables

21a-63=0

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

21a=63

a=63/21

a=3

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