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x in (-oo:+oo)
4-((4/7)*x) > 7 // - 7
4-((4/7)*x)-7 > 0
(-4/7)*x-7+4 > 0
-4/7*x-3 > 0 // + 3
-4/7*x > 3 // : -4/7
x < 3/(-4/7)
x < -21/4
x in (-oo:-21/4)
(-oo:-21/4)
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