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-3(c-18)=-3-18
We move all terms to the left:
-3(c-18)-(-3-18)=0
We add all the numbers together, and all the variables
-3(c-18)-(-21)=0
We add all the numbers together, and all the variables
-3(c-18)+21=0
We multiply parentheses
-3c+54+21=0
We add all the numbers together, and all the variables
-3c+75=0
We move all terms containing c to the left, all other terms to the right
-3c=-75
c=-75/-3
c=+25
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