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a in (-oo:+oo)
(3/5)*a-(4/5) < 7/10 // - 7/10
(3/5)*a-(4/5)-(7/10) < 0
(3/5)*a-4/5-7/10 < 0
3/5*a-3/2 < 0 // + 3/2
3/5*a < 3/2 // : 3/5
a < 3/2/3/5
a < 5/2
a in (-oo:5/2)
(-oo:5/2)
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