9t-2t=21

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Solution for 9t-2t=21 equation: 



9t-2t=21

We move all terms to the left:

9t-2t-(21)=0

We add all the numbers together, and all the variables

7t-21=0

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

7t=21

t=21/7

t=3

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