21=2t+7

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Solution for 21=2t+7 equation: 



21=2t+7

We move all terms to the left:

21-(2t+7)=0

We get rid of parentheses

-2t-7+21=0

We add all the numbers together, and all the variables

-2t+14=0

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

-2t=-14

t=-14/-2

t=+7

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