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y in (-oo:+oo)
28 = -y/8 // + -y/8
28-(-y/8) = 0
(1/8)*y+28 = 0
1/8*y+28 = 0 // - 28
1/8*y = -28 // : 1/8
y = -28/1/8
y = -224
y = -224
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