21-7k=-3k+5

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Solution for 21-7k=-3k+5 equation: 



21-7k=-3k+5

We move all terms to the left:

21-7k-(-3k+5)=0

We get rid of parentheses

-7k+3k-5+21=0

We add all the numbers together, and all the variables

-4k+16=0

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

-4k=-16

k=-16/-4

k=+4

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