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y in (-oo:+oo)
40 = (8/5)*y // - (8/5)*y
40-((8/5)*y) = 0
(-8/5)*y+40 = 0
40-8/5*y = 0 // - 40
-8/5*y = -40 // : -8/5
y = -40/(-8/5)
y = 25
y = 25
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