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x in (-oo:+oo)
(1/7)*x-3 < 1 // - 1
(1/7)*x-3-1 < 0
1/7*x-4 < 0 // + 4
1/7*x < 4 // : 1/7
x < 4/1/7
x < 28
x in (-oo:28)
(-oo:28)
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