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x in (-oo:+oo)
(3/5)*x-2 < 9/10-x // - 9/10-x
(3/5)*x+x-(9/10)-2 < 0
(3/5)*x+x-9/10-2 < 0
8/5*x-29/10 < 0 // + 29/10
8/5*x < 29/10 // : 8/5
x < 29/10/8/5
x < 29/16
x in (-oo:29/16)
(-oo:29/16)
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