t+-8t=-21

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Solution for t+-8t=-21 equation: 



t+-8t=-21

We move all terms to the left:

t+-8t-(-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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