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a in (-oo:+oo)
(-5/6)*a < 2 // - 2
(-5/6)*a-2 < 0
-5/6*a-2 < 0 // + 2
-5/6*a < 2 // : -5/6
a > 2/(-5/6)
a > -12/5
a in (-12/5:+oo)
(-12/5:+oo)
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