-21=1-3k+2

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Solution for -21=1-3k+2 equation: 



-21=1-3k+2

We move all terms to the left:

-21-(1-3k+2)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3k-3-21=0

We add all the numbers together, and all the variables

3k-24=0

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

3k=24

k=24/3

k=8

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