13=-4(k)+9

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Solution for 13=-4(k)+9 equation: 



13=-4(k)+9

We move all terms to the left:

13-(-4(k)+9)=0

We get rid of parentheses

4k-9+13=0

We add all the numbers together, and all the variables

4k+4=0

We move all terms containing k to the left, all other terms to the right

4k=-4

k=-4/4

k=-1

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