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x in (-oo:+oo)
(3/15)*x < 7 // - 7
(3/15)*x-7 < 0
1/5*x-7 < 0 // + 7
1/5*x < 7 // : 1/5
x < 7/1/5
x < 35
x in (-oo:35)
(-oo:35)
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