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5k=-10k+30
We move all terms to the left:
5k-(-10k+30)=0
We get rid of parentheses
5k+10k-30=0
We add all the numbers together, and all the variables
15k-30=0
We move all terms containing k to the left, all other terms to the right
15k=30
k=30/15
k=2
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