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13+2k=3k+
We move all terms to the left:
13+2k-(3k+)=0
We add all the numbers together, and all the variables
2k-(+3k)+13=0
We get rid of parentheses
2k-3k+13=0
We add all the numbers together, and all the variables
-1k+13=0
We move all terms containing k to the left, all other terms to the right
-k=-13
k=-13/-1
k=+13
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