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20(4c-7)=50
We move all terms to the left:
20(4c-7)-(50)=0
We multiply parentheses
80c-140-50=0
We add all the numbers together, and all the variables
80c-190=0
We move all terms containing c to the left, all other terms to the right
80c=190
c=190/80
c=2+3/8
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