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x in (-oo:+oo)
-1/2 = (-5/18)*x // - (-5/18)*x
-((-5/18)*x)-1/2 = 0
(5/18)*x-1/2 = 0
5/18*x-1/2 = 0 // + 1/2
5/18*x = 1/2 // : 5/18
x = 1/2/5/18
x = 9/5
x = 9/5
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