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x in (-oo:+oo)
19 > x/7 // - x/7
19-(x/7) > 0
19-1/7*x > 0 // - 19
-1/7*x > -19 // : -1/7
x < -19/(-1/7)
x < 133
x in (-oo:133)
(-oo:133)
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