-87=-7k+4

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Solution for -87=-7k+4 equation: 



-87=-7k+4

We move all terms to the left:

-87-(-7k+4)=0

We get rid of parentheses

7k-4-87=0

We add all the numbers together, and all the variables

7k-91=0

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

7k=91

k=91/7

k=13

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