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x in (-oo:+oo)
-9 = (-5*x)/4 // - (-5*x)/4
-((-5*x)/4)-9 = 0
(5/4)*x-9 = 0
5/4*x-9 = 0 // + 9
5/4*x = 9 // : 5/4
x = 9/5/4
x = 36/5
x = 36/5
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