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x in (-oo:+oo)
1-(x/5) > 7 // - 7
1-(x/5)-7 > 0
-1/5*x-6 > 0 // + 6
-1/5*x > 6 // : -1/5
x < 6/(-1/5)
x < -30
x in (-oo:-30)
(-oo:-30)
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