21a+7=13

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Solution for 21a+7=13 equation: 



21a+7=13

We move all terms to the left:

21a+7-(13)=0

We add all the numbers together, and all the variables

21a-6=0

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

21a=6

a=6/21

a=2/7

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