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x in (-oo:+oo)
x/(-5)-7 > -12 // + 12
x/(-5)-7+12 > 0
5-1/5*x > 0 // - 5
-1/5*x > -5 // : -1/5
x < -5/(-1/5)
x < 25
x in (-oo:25)
(-oo:25)
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