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x in (-oo:+oo)
(1/3)*x-4 > 12 // - 12
(1/3)*x-12-4 > 0
1/3*x-16 > 0 // + 16
1/3*x > 16 // : 1/3
x > 16/1/3
x > 48
x in (48:+oo)
(48:+oo)
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