13=-4+k

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Solution for 13=-4+k equation: 



13=-4+k

We move all terms to the left:

13-(-4+k)=0

We add all the numbers together, and all the variables

-(k-4)+13=0

We get rid of parentheses

-k+4+13=0

We add all the numbers together, and all the variables

-1k+17=0

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

-k=-17

k=-17/-1

k=+17

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