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40k+40=30k+130
We move all terms to the left:
40k+40-(30k+130)=0
We get rid of parentheses
40k-30k-130+40=0
We add all the numbers together, and all the variables
10k-90=0
We move all terms containing k to the left, all other terms to the right
10k=90
k=90/10
k=9
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