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x in (-oo:+oo)
7-(x/3) > 8 // - 8
7-(x/3)-8 > 0
-1/3*x-1 > 0 // + 1
-1/3*x > 1 // : -1/3
x < 1/(-1/3)
x < -3
x in (-oo:-3)
(-oo:-3)
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