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2014-05-17T22:36:30+03:00
18x -2 ≥ 15x -13
18x -15x ≥-13+2
3x ≥ -11
x ≥ - 11/3  ⇒x∈[ -11/3; α)
2 5 2
2014-05-17T23:01:55+03:00
18x-2>/=15x-13  /+13
18x+11>/=15x→x ={1,2,.........}