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x in (-oo:+oo)
4 > (1/3)*x // - (1/3)*x
4-((1/3)*x) > 0
(-1/3)*x+4 > 0
4-1/3*x > 0 // - 4
-1/3*x > -4 // : -1/3
x < -4/(-1/3)
x < 12
x in (-oo:12)
(-oo:12)
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