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x in (-oo:+oo)
13-((3/4)*x) > 3 // - 3
13-((3/4)*x)-3 > 0
(-3/4)*x-3+13 > 0
10-3/4*x > 0 // - 10
-3/4*x > -10 // : -3/4
x < -10/(-3/4)
x < 40/3
x in (-oo:40/3)
(-oo:40/3)
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