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15=7+4c
We move all terms to the left:
15-(7+4c)=0
We add all the numbers together, and all the variables
-(4c+7)+15=0
We get rid of parentheses
-4c-7+15=0
We add all the numbers together, and all the variables
-4c+8=0
We move all terms containing c to the left, all other terms to the right
-4c=-8
c=-8/-4
c=+2
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