U=4t-21

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Solution for U=4t-21 equation: 



=4U-21

We move all terms to the left:

-(4U-21)=0

We get rid of parentheses

-4U+21=0

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

-4U=-21

U=-21/-4

U=5+1/4

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