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x in (-oo:+oo)
(3/10)*x < -15 // + 15
(3/10)*x+15 < 0
3/10*x+15 < 0 // - 15
3/10*x < -15 // : 3/10
x < -15/3/10
x < -50
x in (-oo:-50)
(-oo:-50)
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