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 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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