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-4a+5=-15-8a
We move all terms to the left:
-4a+5-(-15-8a)=0
We add all the numbers together, and all the variables
-4a-(-8a-15)+5=0
We get rid of parentheses
-4a+8a+15+5=0
We add all the numbers together, and all the variables
4a+20=0
We move all terms containing a to the left, all other terms to the right
4a=-20
a=-20/4
a=-5
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