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x in (-oo:+oo)
(4/7)*x-4 > 12 // - 12
(4/7)*x-12-4 > 0
4/7*x-16 > 0 // + 16
4/7*x > 16 // : 4/7
x > 16/4/7
x > 28
x in (28:+oo)
(28:+oo)
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