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x in (-oo:+oo)
x/8 > -1/5 // + -1/5
x/8-(-1/5) > 0
x/8+1/5 > 0
1/8*x+1/5 > 0 // - 1/5
1/8*x > -1/5 // : 1/8
x > -1/5/1/8
x > -8/5
x in (-8/5:+oo)
(-8/5:+oo)
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