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6(3k+5)=210
We move all terms to the left:
6(3k+5)-(210)=0
We multiply parentheses
18k+30-210=0
We add all the numbers together, and all the variables
18k-180=0
We move all terms containing k to the left, all other terms to the right
18k=180
k=180/18
k=10
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