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13=-3k+9
We move all terms to the left:
13-(-3k+9)=0
We get rid of parentheses
3k-9+13=0
We add all the numbers together, and all the variables
3k+4=0
We move all terms containing k to the left, all other terms to the right
3k=-4
k=-4/3
k=-1+1/3
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