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x in (-oo:+oo)
4*x-(3/(-7)) < -25/4 // + -25/4
4*x-(3/(-7))-(-25/4) < 0
4*x+3/7+25/4 < 0
4*x+187/28 < 0 // - 187/28
4*x < -187/28 // : 4
x < -187/28/4
x < -187/112
x in (-oo:-187/112)
(-oo:-187/112)
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