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13=-4k+19
We move all terms to the left:
13-(-4k+19)=0
We get rid of parentheses
4k-19+13=0
We add all the numbers together, and all the variables
4k-6=0
We move all terms containing k to the left, all other terms to the right
4k=6
k=6/4
k=1+1/2
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