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-31+3k=-14k+18
We move all terms to the left:
-31+3k-(-14k+18)=0
We get rid of parentheses
3k+14k-18-31=0
We add all the numbers together, and all the variables
17k-49=0
We move all terms containing k to the left, all other terms to the right
17k=49
k=49/17
k=2+15/17
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