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120=3(-5a-5)
We move all terms to the left:
120-(3(-5a-5))=0
We calculate terms in parentheses: -(3(-5a-5)), so:We get rid of parentheses
3(-5a-5)
We multiply parentheses
-15a-15
Back to the equation:
-(-15a-15)
15a+15+120=0
We add all the numbers together, and all the variables
15a+135=0
We move all terms containing a to the left, all other terms to the right
15a=-135
a=-135/15
a=-9
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