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x in (-oo:+oo)
-3/4 < -3*x // + -3*x
-(-3*x)-3/4 < 0
3*x-3/4 < 0
3*x-3/4 < 0 // + 3/4
3*x < 3/4 // : 3
x < 3/4/3
x < 1/4
x in (-oo:1/4)
(-oo:1/4)
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