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x in (-oo:+oo)
(7/8)*(40*x^2-(16*x)+32) = 0
(7/8)*(40*x^2-16*x+32) = 0
7/8*(40*x^2-16*x+32) = 0
40*x^2-16*x+32 = 0
8*(5*x^2-2*x+4) = 0
5*x^2-2*x+4 = 0
DELTA = (-2)^2-(4*4*5)
DELTA = -76
DELTA < 0
8 = 0
7/8*8 = 0
x belongs to the empty set
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