21-3k=k-19

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Solution for 21-3k=k-19 equation: 



21-3k=k-19

We move all terms to the left:

21-3k-(k-19)=0

We get rid of parentheses

-3k-k+19+21=0

We add all the numbers together, and all the variables

-4k+40=0

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

-4k=-40

k=-40/-4

k=+10

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