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