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-4k+2(5k-6)=-3k-49
We move all terms to the left:
-4k+2(5k-6)-(-3k-49)=0
We multiply parentheses
-4k+10k-(-3k-49)-12=0
We get rid of parentheses
-4k+10k+3k+49-12=0
We add all the numbers together, and all the variables
9k+37=0
We move all terms containing k to the left, all other terms to the right
9k=-37
k=-37/9
k=-4+1/9
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