4a-2(3-4a)=21

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Solution for 4a-2(3-4a)=21 equation: 



4a-2(3-4a)=21

We move all terms to the left:

4a-2(3-4a)-(21)=0

We add all the numbers together, and all the variables

4a-2(-4a+3)-21=0

We multiply parentheses

4a+8a-6-21=0

We add all the numbers together, and all the variables

12a-27=0

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

12a=27

a=27/12

a=2+1/4

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