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-15=3a+5-2
We move all terms to the left:
-15-(3a+5-2)=0
We add all the numbers together, and all the variables
-(3a+3)-15=0
We get rid of parentheses
-3a-3-15=0
We add all the numbers together, and all the variables
-3a-18=0
We move all terms containing a to the left, all other terms to the right
-3a=18
a=18/-3
a=-6
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