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x in (-oo:+oo)
x/7-20 > -12 // + 12
x/7-20+12 > 0
1/7*x-8 > 0 // + 8
1/7*x > 8 // : 1/7
x > 8/1/7
x > 56
x in (56:+oo)
(56:+oo)
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