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45=9-2k
We move all terms to the left:
45-(9-2k)=0
We add all the numbers together, and all the variables
-(-2k+9)+45=0
We get rid of parentheses
2k-9+45=0
We add all the numbers together, and all the variables
2k+36=0
We move all terms containing k to the left, all other terms to the right
2k=-36
k=-36/2
k=-18
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