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20-4c=-68.4
We move all terms to the left:
20-4c-(-68.4)=0
We add all the numbers together, and all the variables
-4c+88.4=0
We move all terms containing c to the left, all other terms to the right
-4c=-88.4
c=-88.4/-4
c=22+0.40000000000001/4
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