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y in (-oo:+oo)
8 = (2/5)*y // - (2/5)*y
8-((2/5)*y) = 0
(-2/5)*y+8 = 0
8-2/5*y = 0 // - 8
-2/5*y = -8 // : -2/5
y = -8/(-2/5)
y = 20
y = 20
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