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y in (-oo:+oo)
8/7 = (-8/9)*y // - (-8/9)*y
8/7-((-8/9)*y) = 0
(8/9)*y+8/7 = 0
8/9*y+8/7 = 0 // - 8/7
8/9*y = -8/7 // : 8/9
y = -8/7/8/9
y = -9/7
y = -9/7
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