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x in (-oo:+oo)
(1/2)*x < -25 // + 25
(1/2)*x+25 < 0
1/2*x+25 < 0 // - 25
1/2*x < -25 // : 1/2
x < -25/1/2
x < -50
x in (-oo:-50)
(-oo:-50)
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