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50k+100=40k+200
We move all terms to the left:
50k+100-(40k+200)=0
We get rid of parentheses
50k-40k-200+100=0
We add all the numbers together, and all the variables
10k-100=0
We move all terms containing k to the left, all other terms to the right
10k=100
k=100/10
k=10
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