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