21=t+19

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Solution for 21=t+19 equation: 



21=t+19

We move all terms to the left:

21-(t+19)=0

We get rid of parentheses

-t-19+21=0

We add all the numbers together, and all the variables

-1t+2=0

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

-t=-2

t=-2/-1

t=+2

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