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x in (-oo:+oo)
5-((7/3)*x) > 7 // - 7
5-((7/3)*x)-7 > 0
(-7/3)*x-7+5 > 0
-7/3*x-2 > 0 // + 2
-7/3*x > 2 // : -7/3
x < 2/(-7/3)
x < -6/7
x in (-oo:-6/7)
(-oo:-6/7)
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