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x in (-oo:+oo)
2*x-(5/4) < -5 // + 5
2*x-(5/4)+5 < 0
2*x-5/4+5 < 0
2*x+15/4 < 0 // - 15/4
2*x < -15/4 // : 2
x < -15/4/2
x < -15/8
x in (-oo:-15/8)
(-oo:-15/8)
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