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