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-3(5k+2)-6(8k+3)=39
We move all terms to the left:
-3(5k+2)-6(8k+3)-(39)=0
We multiply parentheses
-15k-48k-6-18-39=0
We add all the numbers together, and all the variables
-63k-63=0
We move all terms containing k to the left, all other terms to the right
-63k=63
k=63/-63
k=-1
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