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x in (-oo:+oo)
(1/2)*x > -5/4 // + -5/4
(1/2)*x-(-5/4) > 0
(1/2)*x+5/4 > 0
1/2*x+5/4 > 0 // - 5/4
1/2*x > -5/4 // : 1/2
x > -5/4/1/2
x > -5/2
x in (-5/2:+oo)
(-5/2:+oo)
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