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x in (-oo:+oo)
x/4 < 12 // - 12
x/4-12 < 0
1/4*x-12 < 0 // + 12
1/4*x < 12 // : 1/4
x < 12/1/4
x < 48
x in (-oo:48)
(-oo:48)
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