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13=3k+4
We move all terms to the left:
13-(3k+4)=0
We get rid of parentheses
-3k-4+13=0
We add all the numbers together, and all the variables
-3k+9=0
We move all terms containing k to the left, all other terms to the right
-3k=-9
k=-9/-3
k=+3
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