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x in (-oo:+oo)
x/3-4 < 17 // - 17
x/3-17-4 < 0
1/3*x-21 < 0 // + 21
1/3*x < 21 // : 1/3
x < 21/1/3
x < 63
x in (-oo:63)
(-oo:63)
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