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X in (-oo:+oo)
(9*(5/2)*X)/7 = -15 // + 15
(9*(5/2)*X)/7+15 = 0
45/14*X+15 = 0 // - 15
45/14*X = -15 // : 45/14
X = -15/45/14
X = -14/3
X = -14/3
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