-189=7(-3-3a)

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Solution for -189=7(-3-3a) equation: 



-189=7(-3-3a)

We move all terms to the left:

-189-(7(-3-3a))=0

We add all the numbers together, and all the variables

-(7(-3a-3))-189=0



We calculate terms in parentheses: -(7(-3a-3)), so:

7(-3a-3)

We multiply parentheses

-21a-21

Back to the equation:

-(-21a-21)



We get rid of parentheses

21a+21-189=0

We add all the numbers together, and all the variables

21a-168=0

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

21a=168

a=168/21

a=8

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