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-8+a=-2a-5
We move all terms to the left:
-8+a-(-2a-5)=0
We get rid of parentheses
a+2a+5-8=0
We add all the numbers together, and all the variables
3a-3=0
We move all terms containing a to the left, all other terms to the right
3a=3
a=3/3
a=1
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