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2k-3(2k+3)=45
We move all terms to the left:
2k-3(2k+3)-(45)=0
We multiply parentheses
2k-6k-9-45=0
We add all the numbers together, and all the variables
-4k-54=0
We move all terms containing k to the left, all other terms to the right
-4k=54
k=54/-4
k=-13+1/2
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