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x in (-oo:+oo)
-x/25 <= 75 // - 75
-x/25-75 <= 0
-1/25*x-75 <= 0 // + 75
-1/25*x <= 75 // : -1/25
x >= 75/(-1/25)
x >= -1875
x in <-1875:+oo)
<-1875:+oo)
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