3a-2(2a-5)-2(a+2)=-21

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Solution for 3a-2(2a-5)-2(a+2)=-21 equation: 



3a-2(2a-5)-2(a+2)=-21

We move all terms to the left:

3a-2(2a-5)-2(a+2)-(-21)=0

We add all the numbers together, and all the variables

3a-2(2a-5)-2(a+2)+21=0

We multiply parentheses

3a-4a-2a+10-4+21=0

We add all the numbers together, and all the variables

-3a+27=0

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

-3a=-27

a=-27/-3

a=+9

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