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x in (-oo:+oo)
(-5/13)*x = -9 // + 9
(-5/13)*x+9 = 0
9-5/13*x = 0 // - 9
-5/13*x = -9 // : -5/13
x = -9/(-5/13)
x = 117/5
x = 117/5
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