3a+21=7a+1

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Solution for 3a+21=7a+1 equation: 



3a+21=7a+1

We move all terms to the left:

3a+21-(7a+1)=0

We get rid of parentheses

3a-7a-1+21=0

We add all the numbers together, and all the variables

-4a+20=0

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

-4a=-20

a=-20/-4

a=+5

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