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15=-2a-3a
We move all terms to the left:
15-(-2a-3a)=0
We add all the numbers together, and all the variables
-(-5a)+15=0
We get rid of parentheses
5a+15=0
We move all terms containing a to the left, all other terms to the right
5a=-15
a=-15/5
a=-3
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