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x in (-oo:+oo)
x/(-7) > -4 // + 4
x/(-7)+4 > 0
4-1/7*x > 0 // - 4
-1/7*x > -4 // : -1/7
x < -4/(-1/7)
x < 28
x in (-oo:28)
(-oo:28)
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