2a+21=6a-7

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Solution for 2a+21=6a-7 equation: 



2a+21=6a-7

We move all terms to the left:

2a+21-(6a-7)=0

We get rid of parentheses

2a-6a+7+21=0

We add all the numbers together, and all the variables

-4a+28=0

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

-4a=-28

a=-28/-4

a=+7

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