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y in (-oo:+oo)
-2/3 = (5/8)*y // - (5/8)*y
-((5/8)*y)-2/3 = 0
(-5/8)*y-2/3 = 0
-5/8*y-2/3 = 0 // + 2/3
-5/8*y = 2/3 // : -5/8
y = 2/3/(-5/8)
y = -16/15
y = -16/15
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