21=-4a+2a

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Solution for 21=-4a+2a equation: 



21=-4a+2a

We move all terms to the left:

21-(-4a+2a)=0

We add all the numbers together, and all the variables

-(-2a)+21=0

We get rid of parentheses

2a+21=0

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

2a=-21

a=-21/2

a=-10+1/2

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