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-15=-8+a
We move all terms to the left:
-15-(-8+a)=0
We add all the numbers together, and all the variables
-(a-8)-15=0
We get rid of parentheses
-a+8-15=0
We add all the numbers together, and all the variables
-1a-7=0
We move all terms containing a to the left, all other terms to the right
-a=7
a=7/-1
a=-7
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