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13c+2=-18.5
We move all terms to the left:
13c+2-(-18.5)=0
We add all the numbers together, and all the variables
13c+20.5=0
We move all terms containing c to the left, all other terms to the right
13c=-20.5
c=-20.5/13
c=-1+5/8.66666666667
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