21=5+4t

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Solution for 21=5+4t equation: 



21=5+4t

We move all terms to the left:

21-(5+4t)=0

We add all the numbers together, and all the variables

-(4t+5)+21=0

We get rid of parentheses

-4t-5+21=0

We add all the numbers together, and all the variables

-4t+16=0

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

-4t=-16

t=-16/-4

t=+4

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