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z in (-oo:+oo)
(z^2)/8-(1/4) = (17*z)/24 // - (17*z)/24
(z^2)/8-((17*z)/24)-(1/4) = 0
(z^2)/8+(-17/24)*z-1/4 = 0
1/8*z^2-17/24*z-1/4 = 0
DELTA = (-17/24)^2-(-1/4*1/8*4)
DELTA = 361/576
DELTA > 0
z = ((361/576)^(1/2)+17/24)/(1/8*2) or z = (17/24-(361/576)^(1/2))/(1/8*2)
z = 6 or z = -1/3
z in { -1/3, 6 }
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