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x in (-oo:+oo)
(((5/7)*x^1)/4)*x+10 = (9/10)*x // - (9/10)*x
(((5/7)*x^1)/4)*x-((9/10)*x)+10 = 0
(((5/7)*x)/4)*x+(-9/10)*x+10 = 0
5/28*x^2-9/10*x+10 = 0
DELTA = (-9/10)^2-(5/28*4*10)
DELTA = -4433/700
DELTA < 0
x belongs to the empty set
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