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