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y in (-oo:+oo)
6-((5/8)*y) = 8 // - 8
6-((5/8)*y)-8 = 0
(-5/8)*y-8+6 = 0
-5/8*y-2 = 0 // + 2
-5/8*y = 2 // : -5/8
y = 2/(-5/8)
y = -16/5
y = -16/5
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