21=4t+1

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Solution for 21=4t+1 equation: 



21=4t+1

We move all terms to the left:

21-(4t+1)=0

We get rid of parentheses

-4t-1+21=0

We add all the numbers together, and all the variables

-4t+20=0

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

-4t=-20

t=-20/-4

t=+5

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