-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-24=0

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

-6k=24

k=24/-6

k=-4

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