21=4a-7a

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Solution for 21=4a-7a equation: 



21=4a-7a

We move all terms to the left:

21-(4a-7a)=0

We add all the numbers together, and all the variables

-(-3a)+21=0

We get rid of parentheses

3a+21=0

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

3a=-21

a=-21/3

a=-7

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