21=5t-4

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Solution for 21=5t-4 equation: 



21=5t-4

We move all terms to the left:

21-(5t-4)=0

We get rid of parentheses

-5t+4+21=0

We add all the numbers together, and all the variables

-5t+25=0

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

-5t=-25

t=-25/-5

t=+5

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