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