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2k-10=3k-30
We move all terms to the left:
2k-10-(3k-30)=0
We get rid of parentheses
2k-3k+30-10=0
We add all the numbers together, and all the variables
-1k+20=0
We move all terms containing k to the left, all other terms to the right
-k=-20
k=-20/-1
k=+20
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