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x in (-oo:+oo)
-9 = (-3/8)*x // - (-3/8)*x
-((-3/8)*x)-9 = 0
(3/8)*x-9 = 0
3/8*x-9 = 0 // + 9
3/8*x = 9 // : 3/8
x = 9/3/8
x = 24
x = 24
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