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40=-8-4a
We move all terms to the left:
40-(-8-4a)=0
We add all the numbers together, and all the variables
-(-4a-8)+40=0
We get rid of parentheses
4a+8+40=0
We add all the numbers together, and all the variables
4a+48=0
We move all terms containing a to the left, all other terms to the right
4a=-48
a=-48/4
a=-12
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