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x in (-oo:+oo)
(1/5)*x < -3 // + 3
(1/5)*x+3 < 0
1/5*x+3 < 0 // - 3
1/5*x < -3 // : 1/5
x < -3/1/5
x < -15
x in (-oo:-15)
(-oo:-15)
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