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x in (-oo:+oo)
80/65 > (-8/13)*x // - (-8/13)*x
80/65-((-8/13)*x) > 0
(8/13)*x+80/65 > 0
8/13*x+16/13 > 0 // - 16/13
8/13*x > -16/13 // : 8/13
x > -16/13/8/13
x > -2
x in (-2:+oo)
(-2:+oo)
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