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2(3k+6)-4(2k-6)-7k=0
We add all the numbers together, and all the variables
-7k+2(3k+6)-4(2k-6)=0
We multiply parentheses
-7k+6k-8k+12+24=0
We add all the numbers together, and all the variables
-9k+36=0
We move all terms containing k to the left, all other terms to the right
-9k=-36
k=-36/-9
k=+4
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