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x in (-oo:+oo)
-x/7 > 3 // - 3
-x/7-3 > 0
-1/7*x-3 > 0 // + 3
-1/7*x > 3 // : -1/7
x < 3/(-1/7)
x < -21
x in (-oo:-21)
(-oo:-21)
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