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x in (-oo:+oo)
40 < (-4/5)*x // - (-4/5)*x
40-((-4/5)*x) < 0
(4/5)*x+40 < 0
4/5*x+40 < 0 // - 40
4/5*x < -40 // : 4/5
x < -40/4/5
x < -50
x in (-oo:-50)
(-oo:-50)
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