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3k+17=20k-51
We move all terms to the left:
3k+17-(20k-51)=0
We get rid of parentheses
3k-20k+51+17=0
We add all the numbers together, and all the variables
-17k+68=0
We move all terms containing k to the left, all other terms to the right
-17k=-68
k=-68/-17
k=+4
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