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x in (-oo:+oo)
((5*x)/6)*x-1 < -1 // + 1
((5*x)/6)*x-1+1 < 0
5/6*x^2 < 0
5/6*x^2 < 0 // : 5/6
x^2 < 0/5/6
x^2 < 0
x belongs to the empty set
x belongs to the empty set
0
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