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-126=9k+9
We move all terms to the left:
-126-(9k+9)=0
We get rid of parentheses
-9k-9-126=0
We add all the numbers together, and all the variables
-9k-135=0
We move all terms containing k to the left, all other terms to the right
-9k=135
k=135/-9
k=-15
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