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18.11=2.59c+13.76+-1.72c
We move all terms to the left:
18.11-(2.59c+13.76+-1.72c)=0
We add all the numbers together, and all the variables
-(+0.87c)+18.11=0
We get rid of parentheses
-0.87c+18.11=0
We move all terms containing c to the left, all other terms to the right
-0.87c=-18.11
c=-18.11/-0.87
c=20+0.71/0.87
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