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a in (-oo:+oo)
(2/3)*a-3 > -11 // + 11
(2/3)*a-3+11 > 0
2/3*a+8 > 0 // - 8
2/3*a > -8 // : 2/3
a > -8/2/3
a > -12
a in (-12:+oo)
(-12:+oo)
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