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x in (-oo:+oo)
x/2-20 < 1 // - 1
x/2-20-1 < 0
1/2*x-21 < 0 // + 21
1/2*x < 21 // : 1/2
x < 21/1/2
x < 42
x in (-oo:42)
(-oo:42)
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