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-7.8c=-1.56
We move all terms to the left:
-7.8c-(-1.56)=0
We add all the numbers together, and all the variables
-7.8c+1.56=0
We move all terms containing c to the left, all other terms to the right
-7.8c=-1.56
c=-1.56/-7.8
c=1/5
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