t+21=2t

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Solution for t+21=2t equation: 



t+21=2t

We move all terms to the left:

t+21-(2t)=0

We add all the numbers together, and all the variables

-1t+21=0

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

-t=-21

t=-21/-1

t=+21

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