2a+21=3a-1

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Solution for 2a+21=3a-1 equation: 



2a+21=3a-1

We move all terms to the left:

2a+21-(3a-1)=0

We get rid of parentheses

2a-3a+1+21=0

We add all the numbers together, and all the variables

-1a+22=0

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

-a=-22

a=-22/-1

a=+22

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