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x in (-oo:+oo)
x/13-10 < -8 // + 8
x/13-10+8 < 0
1/13*x-2 < 0 // + 2
1/13*x < 2 // : 1/13
x < 2/1/13
x < 26
x in (-oo:26)
(-oo:26)
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