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18=3k-45
We move all terms to the left:
18-(3k-45)=0
We get rid of parentheses
-3k+45+18=0
We add all the numbers together, and all the variables
-3k+63=0
We move all terms containing k to the left, all other terms to the right
-3k=-63
k=-63/-3
k=+21
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