-13=21-t

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Solution for -13=21-t equation: 



-13=21-t

We move all terms to the left:

-13-(21-t)=0

We add all the numbers together, and all the variables

-(-1t+21)-13=0

We get rid of parentheses

1t-21-13=0

We add all the numbers together, and all the variables

t-34=0

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

t=34

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