-3t+9-21=t

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Solution for -3t+9-21=t equation: 



-3t+9-21=t

We move all terms to the left:

-3t+9-21-(t)=0

We add all the numbers together, and all the variables

-4t-12=0

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

-4t=12

t=12/-4

t=-3

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