-3(8+2a)=-21

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Solution for -3(8+2a)=-21 equation: 



-3(8+2a)=-21

We move all terms to the left:

-3(8+2a)-(-21)=0

We add all the numbers together, and all the variables

-3(2a+8)-(-21)=0

We add all the numbers together, and all the variables

-3(2a+8)+21=0

We multiply parentheses

-6a-24+21=0

We add all the numbers together, and all the variables

-6a-3=0

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

-6a=3

a=3/-6

a=-1/2

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