3(2a+3)-4(3a-6)=21

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Solution for 3(2a+3)-4(3a-6)=21 equation: 



3(2a+3)-4(3a-6)=21

We move all terms to the left:

3(2a+3)-4(3a-6)-(21)=0

We multiply parentheses

6a-12a+9+24-21=0

We add all the numbers together, and all the variables

-6a+12=0

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

-6a=-12

a=-12/-6

a=+2

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