63/x=x/7

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Solution for 63/x=x/7 equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

63/x = x/7 // - x/7

63/x-(x/7) = 0

63*x^-1-1/7*x^1 = 0

(63*x^0-1/7*x^2)/(x^1) = 0 // * x^2

x^1*(63*x^0-1/7*x^2) = 0

x^1

(-1/7)*x^2+63 = 0

(-1/7)*x^2+63 = 0

DELTA = 0^2-(4*63*(-1/7))

DELTA = 36

DELTA > 0

x = (36^(1/2)+0)/(2*(-1/7)) or x = (0-36^(1/2))/(2*(-1/7))

x = -21 or x = 21

x in { -21, 21} 

x in { -21, 21 }

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