13=21t-8

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Solution for 13=21t-8 equation: 



13=21t-8

We move all terms to the left:

13-(21t-8)=0

We get rid of parentheses

-21t+8+13=0

We add all the numbers together, and all the variables

-21t+21=0

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

-21t=-21

t=-21/-21

t=1

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