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y in (-oo:+oo)
40 = (4/5)*y // - (4/5)*y
40-((4/5)*y) = 0
(-4/5)*y+40 = 0
40-4/5*y = 0 // - 40
-4/5*y = -40 // : -4/5
y = -40/(-4/5)
y = 50
y = 50
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