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x in (-oo:+oo)
3 > 7*x-(36/7) // - 7*x-(36/7)
36/7-(7*x)+3 > 0
36/7-7*x+3 > 0
57/7-7*x > 0 // - 57/7
-7*x > -57/7 // : -7
x < -57/7/(-7)
x < 57/49
x in (-oo:57/49)
(-oo:57/49)
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