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x in (-oo:+oo)
(-7/4)*x > -3/8 // + -3/8
(-7/4)*x-(-3/8) > 0
(-7/4)*x+3/8 > 0
3/8-7/4*x > 0 // - 3/8
-7/4*x > -3/8 // : -7/4
x < -3/8/(-7/4)
x < 3/14
x in (-oo:3/14)
(-oo:3/14)
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