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40=16+8a
We move all terms to the left:
40-(16+8a)=0
We add all the numbers together, and all the variables
-(8a+16)+40=0
We get rid of parentheses
-8a-16+40=0
We add all the numbers together, and all the variables
-8a+24=0
We move all terms containing a to the left, all other terms to the right
-8a=-24
a=-24/-8
a=+3
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