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13=5+2k
We move all terms to the left:
13-(5+2k)=0
We add all the numbers together, and all the variables
-(2k+5)+13=0
We get rid of parentheses
-2k-5+13=0
We add all the numbers together, and all the variables
-2k+8=0
We move all terms containing k to the left, all other terms to the right
-2k=-8
k=-8/-2
k=+4
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