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y in (-oo:+oo)
1/8 = (4/5)*y // - (4/5)*y
1/8-((4/5)*y) = 0
(-4/5)*y+1/8 = 0
1/8-4/5*y = 0 // - 1/8
-4/5*y = -1/8 // : -4/5
y = -1/8/(-4/5)
y = 5/32
y = 5/32
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