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