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50k+18=40k+120
We move all terms to the left:
50k+18-(40k+120)=0
We get rid of parentheses
50k-40k-120+18=0
We add all the numbers together, and all the variables
10k-102=0
We move all terms containing k to the left, all other terms to the right
10k=102
k=102/10
k=10+1/5
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