(21-7x)/18x

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Solution for (21-7x)/18x equation: 


x in (-oo:+oo)

x*((21-(7*x))/18) = 0

x*((21-7*x)/18) = 0

(x*(21-7*x))/18 = 0

( 21-7*x )

21-7*x = 0 // - 21

-7*x = -21 // : -7

x = -21/(-7)

x = 3

( x )

x = 0

x in { 3, 0 }

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