21=-5t-2t

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Solution for 21=-5t-2t equation: 



21=-5t-2t

We move all terms to the left:

21-(-5t-2t)=0

We add all the numbers together, and all the variables

-(-7t)+21=0

We get rid of parentheses

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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