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5(3a+1)=-115
We move all terms to the left:
5(3a+1)-(-115)=0
We add all the numbers together, and all the variables
5(3a+1)+115=0
We multiply parentheses
15a+5+115=0
We add all the numbers together, and all the variables
15a+120=0
We move all terms containing a to the left, all other terms to the right
15a=-120
a=-120/15
a=-8
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