2/7x^2-x=1/7

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Solution for 2/7x^2-x=1/7 equation: 


x in (-oo:+oo)

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

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

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

2/7*x^2-x-1/7 = 0

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

DELTA = 57/49

DELTA > 0

x = ((57/49)^(1/2)+1)/(2/7*2) or x = (1-(57/49)^(1/2))/(2/7*2)

x = 7/4*((57/49)^(1/2)+1) or x = 7/4*(1-(57/49)^(1/2))

x in { 7/4*(1-(57/49)^(1/2)), 7/4*((57/49)^(1/2)+1) }

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