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x in (-oo:+oo)
x/4-x^2-(((8*x)/4)*x)-5 = 7/4 // - 7/4
x/4-x^2-(((8*x)/4)*x)-(7/4)-5 = 0
x/4-x^2-2*x^2-7/4-5 = 0
1/4*x-3*x^2-27/4 = 0
DELTA = (1/4)^2-(-27/4*(-3)*4)
DELTA = -1295/16
DELTA < 0
x belongs to the empty set
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