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x in (-oo:+oo)
(-3/10)*x-7 < 12 // - 12
(-3/10)*x-12-7 < 0
-3/10*x-19 < 0 // + 19
-3/10*x < 19 // : -3/10
x > 19/(-3/10)
x > -190/3
x in (-190/3:+oo)
(-190/3:+oo)
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