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15=11c+4
We move all terms to the left:
15-(11c+4)=0
We get rid of parentheses
-11c-4+15=0
We add all the numbers together, and all the variables
-11c+11=0
We move all terms containing c to the left, all other terms to the right
-11c=-11
c=-11/-11
c=1
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