120=-5(-3+3a)

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Solution for 120=-5(-3+3a) equation: 



120=-5(-3+3a)

We move all terms to the left:

120-(-5(-3+3a))=0

We add all the numbers together, and all the variables

-(-5(3a-3))+120=0



We calculate terms in parentheses: -(-5(3a-3)), so:

-5(3a-3)

We multiply parentheses

-15a+15

Back to the equation:

-(-15a+15)



We get rid of parentheses

15a-15+120=0

We add all the numbers together, and all the variables

15a+105=0

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

15a=-105

a=-105/15

a=-7

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