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x in (-oo:+oo)
(4/7)*x < 20 // - 20
(4/7)*x-20 < 0
4/7*x-20 < 0 // + 20
4/7*x < 20 // : 4/7
x < 20/4/7
x < 35
x in (-oo:35)
(-oo:35)
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