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4k-3(2k-3)=45
We move all terms to the left:
4k-3(2k-3)-(45)=0
We multiply parentheses
4k-6k+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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