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5(-a-3)=-5a-15
We move all terms to the left:
5(-a-3)-(-5a-15)=0
We add all the numbers together, and all the variables
5(-1a-3)-(-5a-15)=0
We multiply parentheses
-5a-(-5a-15)-15=0
We get rid of parentheses
-5a+5a+15-15=0
We add all the numbers together, and all the variables
=0
a=0/1
a=0
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