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13+2k=3k+4k-12
We move all terms to the left:
13+2k-(3k+4k-12)=0
We add all the numbers together, and all the variables
2k-(7k-12)+13=0
We get rid of parentheses
2k-7k+12+13=0
We add all the numbers together, and all the variables
-5k+25=0
We move all terms containing k to the left, all other terms to the right
-5k=-25
k=-25/-5
k=+5
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