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y in (-oo:+oo)
40 = (5/8)*y // - (5/8)*y
40-((5/8)*y) = 0
(-5/8)*y+40 = 0
40-5/8*y = 0 // - 40
-5/8*y = -40 // : -5/8
y = -40/(-5/8)
y = 64
y = 64
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