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x in (-oo:+oo)
x/(-7) < 6 // - 6
x/(-7)-6 < 0
-1/7*x-6 < 0 // + 6
-1/7*x < 6 // : -1/7
x > 6/(-1/7)
x > -42
x in (-42:+oo)
(-42:+oo)
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