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13=3-2k-3k
We move all terms to the left:
13-(3-2k-3k)=0
We add all the numbers together, and all the variables
-(-5k+3)+13=0
We get rid of parentheses
5k-3+13=0
We add all the numbers together, and all the variables
5k+10=0
We move all terms containing k to the left, all other terms to the right
5k=-10
k=-10/5
k=-2
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