X=21/5x*5x

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Solution for X=21/5x*5x equation: 


x in (-oo:+oo)

X = 5*(21/5)*x*x // - 5*(21/5)*x*x

X-(5*(21/5)*x*x) = 0

X-21*x^2 = 0

-21*x^2 = -X // : -21

x^2 = X/21

x^2 = X/21 // ^ 1/2

abs(x) = (X^(1/2))/(21^(1/2))

x = (X^(1/2))/(21^(1/2)) or x = -((X^(1/2))/(21^(1/2)))

x in { (X^(1/2))/(21^(1/2)), -((X^(1/2))/(21^(1/2))) }

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