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-5(a-3)=115
We move all terms to the left:
-5(a-3)-(115)=0
We multiply parentheses
-5a+15-115=0
We add all the numbers together, and all the variables
-5a-100=0
We move all terms containing a to the left, all other terms to the right
-5a=100
a=100/-5
a=-20
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