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y in (-oo:+oo)
20 = (4/5)*y // - (4/5)*y
20-((4/5)*y) = 0
(-4/5)*y+20 = 0
20-4/5*y = 0 // - 20
-4/5*y = -20 // : -4/5
y = -20/(-4/5)
y = 25
y = 25
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