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x in (-oo:+oo)
(1/10)*x < -3 // + 3
(1/10)*x+3 < 0
1/10*x+3 < 0 // - 3
1/10*x < -3 // : 1/10
x < -3/1/10
x < -30
x in (-oo:-30)
(-oo:-30)
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