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x in (-oo:+oo)
(-7/2)*x > 3 // - 3
(-7/2)*x-3 > 0
-7/2*x-3 > 0 // + 3
-7/2*x > 3 // : -7/2
x < 3/(-7/2)
x < -6/7
x in (-oo:-6/7)
(-oo:-6/7)
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