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x in (-oo:+oo)
16 = (-8/9)*x // - (-8/9)*x
16-((-8/9)*x) = 0
(8/9)*x+16 = 0
8/9*x+16 = 0 // - 16
8/9*x = -16 // : 8/9
x = -16/8/9
x = -18
x = -18
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