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x in (-oo:+oo)
10-((2/5)*x) > 0
(-2/5)*x+10 > 0
10-2/5*x > 0 // - 10
-2/5*x > -10 // : -2/5
x < -10/(-2/5)
x < 25
x in (-oo:25)
(-oo:25)
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