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-42=k/10-51
We move all terms to the left:
-42-(k/10-51)=0
We get rid of parentheses
-k/10+51-42=0
We multiply all the terms by the denominator
-k+51*10-42*10=0
We add all the numbers together, and all the variables
-1k+90=0
We move all terms containing k to the left, all other terms to the right
-k=-90
k=-90/-1
k=+90
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