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40=4c+16
We move all terms to the left:
40-(4c+16)=0
We get rid of parentheses
-4c-16+40=0
We add all the numbers together, and all the variables
-4c+24=0
We move all terms containing c to the left, all other terms to the right
-4c=-24
c=-24/-4
c=+6
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