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x in (-oo:+oo)
-((3*x)/10)-7 < 1/2 // - 1/2
-((3*x)/10)-(1/2)-7 < 0
(-3/10)*x-1/2-7 < 0
-3/10*x-15/2 < 0 // + 15/2
-3/10*x < 15/2 // : -3/10
x > 15/2/(-3/10)
x > -25
x in (-25:+oo)
(-25:+oo)
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