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x in (-oo:+oo)
-16 = (-4/9)*x // - (-4/9)*x
-((-4/9)*x)-16 = 0
(4/9)*x-16 = 0
4/9*x-16 = 0 // + 16
4/9*x = 16 // : 4/9
x = 16/4/9
x = 36
x = 36
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