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x in (-oo:+oo)
(-7/12)*x > 3 // - 3
(-7/12)*x-3 > 0
-7/12*x-3 > 0 // + 3
-7/12*x > 3 // : -7/12
x < 3/(-7/12)
x < -36/7
x in (-oo:-36/7)
(-oo:-36/7)
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