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300k+100=20k+130
We move all terms to the left:
300k+100-(20k+130)=0
We get rid of parentheses
300k-20k-130+100=0
We add all the numbers together, and all the variables
280k-30=0
We move all terms containing k to the left, all other terms to the right
280k=30
k=30/280
k=3/28
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