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40=10+5c
We move all terms to the left:
40-(10+5c)=0
We add all the numbers together, and all the variables
-(5c+10)+40=0
We get rid of parentheses
-5c-10+40=0
We add all the numbers together, and all the variables
-5c+30=0
We move all terms containing c to the left, all other terms to the right
-5c=-30
c=-30/-5
c=+6
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