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3=4k-13
We move all terms to the left:
3-(4k-13)=0
We get rid of parentheses
-4k+13+3=0
We add all the numbers together, and all the variables
-4k+16=0
We move all terms containing k to the left, all other terms to the right
-4k=-16
k=-16/-4
k=+4
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