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45=2k+k
We move all terms to the left:
45-(2k+k)=0
We add all the numbers together, and all the variables
-(+3k)+45=0
We get rid of parentheses
-3k+45=0
We move all terms containing k to the left, all other terms to the right
-3k=-45
k=-45/-3
k=+15
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