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x in (-oo:+oo)
x-((((3/4)*x)/3)*x)-(9/8) = 0
(-1/4)*x^2+x-9/8 = 0
x-1/4*x^2-9/8 = 0
DELTA = 1^2-(-9/8*(-1/4)*4)
DELTA = -1/8
DELTA < 0
x belongs to the empty set
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