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x in (-oo:+oo)
(-2*x)/7-4 > -3 // + 3
(-2*x)/7-4+3 > 0
-2/7*x-1 > 0 // + 1
-2/7*x > 1 // : -2/7
x < 1/(-2/7)
x < -7/2
x in (-oo:-7/2)
(-oo:-7/2)
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