12=-7t-9

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Solution for 12=-7t-9 equation: 



12=-7t-9

We move all terms to the left:

12-(-7t-9)=0

We get rid of parentheses

7t+9+12=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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