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13=-4k+913=-4k+9
We move all terms to the left:
13-(-4k+913)=0
We get rid of parentheses
4k-913+13=0
We add all the numbers together, and all the variables
4k-900=0
We move all terms containing k to the left, all other terms to the right
4k=900
k=900/4
k=225
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