21=21*9t

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Solution for 21=21*9t equation: 



21=21*9t

We move all terms to the left:

21-(21*9t)=0

We add all the numbers together, and all the variables

-(+21*9t)+21=0

We get rid of parentheses

-21*9t+21=0

Wy multiply elements

-189t+21=0

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

-189t=-21

t=-21/-189

t=1/9

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