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x in (-oo:+oo)
(-2/3)*x-10 < 1/3 // - 1/3
(-2/3)*x-(1/3)-10 < 0
(-2/3)*x-1/3-10 < 0
-2/3*x-31/3 < 0 // + 31/3
-2/3*x < 31/3 // : -2/3
x > 31/3/(-2/3)
x > -31/2
x in (-31/2:+oo)
(-31/2:+oo)
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