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15=7c+3-5c
We move all terms to the left:
15-(7c+3-5c)=0
We add all the numbers together, and all the variables
-(2c+3)+15=0
We get rid of parentheses
-2c-3+15=0
We add all the numbers together, and all the variables
-2c+12=0
We move all terms containing c to the left, all other terms to the right
-2c=-12
c=-12/-2
c=+6
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