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x in (-oo:+oo)
x/4-8 < -10 // + 10
x/4-8+10 < 0
1/4*x+2 < 0 // - 2
1/4*x < -2 // : 1/4
x < -2/1/4
x < -8
x in (-oo:-8)
(-oo:-8)
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