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-3k+20=-14k+13k-20
We move all terms to the left:
-3k+20-(-14k+13k-20)=0
We add all the numbers together, and all the variables
-3k-(-1k-20)+20=0
We get rid of parentheses
-3k+1k+20+20=0
We add all the numbers together, and all the variables
-2k+40=0
We move all terms containing k to the left, all other terms to the right
-2k=-40
k=-40/-2
k=+20
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