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x in (-oo:+oo)
x-9 = (5/9)*(5-(8*x)) // - (5/9)*(5-(8*x))
x-((5/9)*(5-(8*x)))-9 = 0
(-5/9)*(5-8*x)+x-9 = 0
x-5/9*(5-8*x)-9 = 0
x-5/9*(5-8*x)-9 = 0
49/9*x-9-25/9 = 0
49/9*x-106/9 = 0
49/9*x-106/9 = 0
49/9*x-106/9 = 0 // + 106/9
49/9*x = 106/9 // : 49/9
x = 106/9/49/9
x = 106/49
x = 106/49
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