12=9-t

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Solution for 12=9-t equation: 



12=9-t

We move all terms to the left:

12-(9-t)=0

We add all the numbers together, and all the variables

-(-1t+9)+12=0

We get rid of parentheses

1t-9+12=0

We add all the numbers together, and all the variables

t+3=0

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

t=-3

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