21=3/7u

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Solution for 21=3/7u equation:


21=3/7u

We simplify the equation to the form, which is simple to understand 
21=3/7u

We move all terms containing u to the left and all other terms to the right. 
-7u=-21

We simplify left and right side of the equation. 
-7u=-21

We divide both sides of the equation by -07 to get u. 
u=3

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