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x in (-oo:+oo)
(1/8)*x^2-((5/6)*x) = 7/12 // - 7/12
(1/8)*x^2-((5/6)*x)-(7/12) = 0
(1/8)*x^2+(-5/6)*x-7/12 = 0
1/8*x^2-5/6*x-7/12 = 0
DELTA = (-5/6)^2-(-7/12*1/8*4)
DELTA = 71/72
DELTA > 0
x = ((71/72)^(1/2)+5/6)/(1/8*2) or x = (5/6-(71/72)^(1/2))/(1/8*2)
x = 4*((71/72)^(1/2)+5/6) or x = 4*(5/6-(71/72)^(1/2))
x in { 4*(5/6-(71/72)^(1/2)), 4*((71/72)^(1/2)+5/6) }
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