-9(4+2a)=21

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Solution for -9(4+2a)=21 equation: 



-9(4+2a)=21

We move all terms to the left:

-9(4+2a)-(21)=0

We add all the numbers together, and all the variables

-9(2a+4)-21=0

We multiply parentheses

-18a-36-21=0

We add all the numbers together, and all the variables

-18a-57=0

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

-18a=57

a=57/-18

a=-3+1/6

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