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50k+90-40k=40k+110-40k
We move all terms to the left:
50k+90-40k-(40k+110-40k)=0
We add all the numbers together, and all the variables
50k-40k+90-110=0
We add all the numbers together, and all the variables
10k-20=0
We move all terms containing k to the left, all other terms to the right
10k=20
k=20/10
k=2
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