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x in (-oo:+oo)
6 > x/(-7) // - x/(-7)
6-(x/(-7)) > 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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