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-40=8c+2c
We move all terms to the left:
-40-(8c+2c)=0
We add all the numbers together, and all the variables
-(+10c)-40=0
We get rid of parentheses
-10c-40=0
We move all terms containing c to the left, all other terms to the right
-10c=40
c=40/-10
c=-4
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