-3(1-4k)=21

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Solution for -3(1-4k)=21 equation: 



-3(1-4k)=21

We move all terms to the left:

-3(1-4k)-(21)=0

We add all the numbers together, and all the variables

-3(-4k+1)-21=0

We multiply parentheses

12k-3-21=0

We add all the numbers together, and all the variables

12k-24=0

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

12k=24

k=24/12

k=2

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