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y in (-oo:+oo)
8 = (-4/9)*y // - (-4/9)*y
8-((-4/9)*y) = 0
(4/9)*y+8 = 0
4/9*y+8 = 0 // - 8
4/9*y = -8 // : 4/9
y = -8/4/9
y = -18
y = -18
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