21-7x/18x

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Solution for 21-7x/18x equation: 


x in (-oo:+oo)

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

(-7/18)*x^2+21 = 0

-7/18*x^2 = -21 // : -7/18

x^2 = 54

x^2 = 54 // ^ 1/2

abs(x) = 3*6^(1/2)

x = 3*6^(1/2) or x = -(3*6^(1/2))

x in { 3*6^(1/2), -(3*6^(1/2)) }

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