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-3k+6(5k-1)=210
We move all terms to the left:
-3k+6(5k-1)-(210)=0
We multiply parentheses
-3k+30k-6-210=0
We add all the numbers together, and all the variables
27k-216=0
We move all terms containing k to the left, all other terms to the right
27k=216
k=216/27
k=8
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