21t-7t=28

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Solution for 21t-7t=28 equation: 



21t-7t=28

We move all terms to the left:

21t-7t-(28)=0

We add all the numbers together, and all the variables

14t-28=0

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

14t=28

t=28/14

t=2

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