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X in (-oo:+oo)
-5/2 = (-9/7)*X-(8/5) // - (-9/7)*X-(8/5)
8/5-((-9/7)*X)-5/2 = 0
(9/7)*X-5/2+8/5 = 0
9/7*X-9/10 = 0 // + 9/10
9/7*X = 9/10 // : 9/7
X = 9/10/9/7
X = 7/10
X = 7/10
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