21a+27=42a+20

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Solution for 21a+27=42a+20 equation: 



21a+27=42a+20

We move all terms to the left:

21a+27-(42a+20)=0

We get rid of parentheses

21a-42a-20+27=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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