3a-21=4a-8

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Solution for 3a-21=4a-8 equation: 



3a-21=4a-8

We move all terms to the left:

3a-21-(4a-8)=0

We get rid of parentheses

3a-4a+8-21=0

We add all the numbers together, and all the variables

-1a-13=0

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

-a=13

a=13/-1

a=-13

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