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x in (-oo:+oo)
(6/7)*x < 10 // - 10
(6/7)*x-10 < 0
6/7*x-10 < 0 // + 10
6/7*x < 10 // : 6/7
x < 10/6/7
x < 35/3
x in (-oo:35/3)
(-oo:35/3)
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