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x in (-oo:+oo)
-15 > (-3/5)*x // - (-3/5)*x
-((-3/5)*x)-15 > 0
(3/5)*x-15 > 0
3/5*x-15 > 0 // + 15
3/5*x > 15 // : 3/5
x > 15/3/5
x > 25
x in (25:+oo)
(25:+oo)
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