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3(c-18)=-30
We move all terms to the left:
3(c-18)-(-30)=0
We add all the numbers together, and all the variables
3(c-18)+30=0
We multiply parentheses
3c-54+30=0
We add all the numbers together, and all the variables
3c-24=0
We move all terms containing c to the left, all other terms to the right
3c=24
c=24/3
c=8
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