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18(c-7)=10*9
We move all terms to the left:
18(c-7)-(10*9)=0
We add all the numbers together, and all the variables
18(c-7)-90=0
We multiply parentheses
18c-126-90=0
We add all the numbers together, and all the variables
18c-216=0
We move all terms containing c to the left, all other terms to the right
18c=216
c=216/18
c=12
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