-4(5-9k)=21

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Solution for -4(5-9k)=21 equation: 



-4(5-9k)=21

We move all terms to the left:

-4(5-9k)-(21)=0

We add all the numbers together, and all the variables

-4(-9k+5)-21=0

We multiply parentheses

36k-20-21=0

We add all the numbers together, and all the variables

36k-41=0

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

36k=41

k=41/36

k=1+5/36

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