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5(2c-8)=7
We move all terms to the left:
5(2c-8)-(7)=0
We multiply parentheses
10c-40-7=0
We add all the numbers together, and all the variables
10c-47=0
We move all terms containing c to the left, all other terms to the right
10c=47
c=47/10
c=4+7/10
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