3(-2k+1)=21

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



3(-2k+1)=21

We move all terms to the left:

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

We multiply parentheses

-6k+3-21=0

We add all the numbers together, and all the variables

-6k-18=0

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

-6k=18

k=18/-6

k=-3

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