x=4-8x/21x

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Solution for x=4-8x/21x equation: 


x in (-oo:+oo)

x = 4-(((8*x)/21)*x) // - 4-(((8*x)/21)*x)

((8*x)/21)*x+x-4 = 0

8/21*x^2+x-4 = 0

DELTA = 1^2-(-4*8/21*4)

DELTA = 149/21

DELTA > 0

x = ((149/21)^(1/2)-1)/(8/21*2) or x = (-(149/21)^(1/2)-1)/(8/21*2)

x = 21/16*((149/21)^(1/2)-1) or x = -21/16*((149/21)^(1/2)+1)

x in { -21/16*((149/21)^(1/2)+1), 21/16*((149/21)^(1/2)-1) }

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