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x in (-oo:+oo)
x/5 = x-9-6 // - x-9-6
x/5-x+6+9 = 0
15-4/5*x = 0 // - 15
-4/5*x = -15 // : -4/5
x = -15/(-4/5)
x = 75/4
x = 75/4
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