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a in (-oo:+oo)
-3/4 > (-6/10)*a // - (-6/10)*a
-((-6/10)*a)-3/4 > 0
(3/5)*a-3/4 > 0
3/5*a-3/4 > 0 // + 3/4
3/5*a > 3/4 // : 3/5
a > 3/4/3/5
a > 5/4
a in (5/4:+oo)
(5/4:+oo)
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