t+12=4t-9

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Solution for t+12=4t-9 equation: 



t+12=4t-9

We move all terms to the left:

t+12-(4t-9)=0

We get rid of parentheses

t-4t+9+12=0

We add all the numbers together, and all the variables

-3t+21=0

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

-3t=-21

t=-21/-3

t=+7

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