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13=-4k+8
We move all terms to the left:
13-(-4k+8)=0
We get rid of parentheses
4k-8+13=0
We add all the numbers together, and all the variables
4k+5=0
We move all terms containing k to the left, all other terms to the right
4k=-5
k=-5/4
k=-1+1/4
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