20=13+-t

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Solution for 20=13+-t equation: 



20=13+-t

We move all terms to the left:

20-(13+-t)=0

We add all the numbers together, and all the variables

-(-1t)+20=0

We get rid of parentheses

1t+20=0

We add all the numbers together, and all the variables

t+20=0

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

t=-20

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