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30k+100k=20k+130
We move all terms to the left:
30k+100k-(20k+130)=0
We add all the numbers together, and all the variables
130k-(20k+130)=0
We get rid of parentheses
130k-20k-130=0
We add all the numbers together, and all the variables
110k-130=0
We move all terms containing k to the left, all other terms to the right
110k=130
k=130/110
k=1+2/11
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