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13(9k+12)=15
We move all terms to the left:
13(9k+12)-(15)=0
We multiply parentheses
117k+156-15=0
We add all the numbers together, and all the variables
117k+141=0
We move all terms containing k to the left, all other terms to the right
117k=-141
k=-141/117
k=-1+8/39
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