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40k+90k=30k+100
We move all terms to the left:
40k+90k-(30k+100)=0
We add all the numbers together, and all the variables
130k-(30k+100)=0
We get rid of parentheses
130k-30k-100=0
We add all the numbers together, and all the variables
100k-100=0
We move all terms containing k to the left, all other terms to the right
100k=100
k=100/100
k=1
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