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y in (-oo:+oo)
1/8 = -y/5 // + -y/5
1/8-(-y/5) = 0
(1/5)*y+1/8 = 0
1/5*y+1/8 = 0 // - 1/8
1/5*y = -1/8 // : 1/5
y = -1/8/1/5
y = -5/8
y = -5/8
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