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11-20c=-15-18c
We move all terms to the left:
11-20c-(-15-18c)=0
We add all the numbers together, and all the variables
-20c-(-18c-15)+11=0
We get rid of parentheses
-20c+18c+15+11=0
We add all the numbers together, and all the variables
-2c+26=0
We move all terms containing c to the left, all other terms to the right
-2c=-26
c=-26/-2
c=+13
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