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X in (-oo:+oo)
(2/5)*X+11 = 9/2 // - 9/2
(2/5)*X-(9/2)+11 = 0
(2/5)*X-9/2+11 = 0
2/5*X+13/2 = 0 // - 13/2
2/5*X = -13/2 // : 2/5
X = -13/2/2/5
X = -65/4
X = -65/4
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