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y in (-oo:+oo)
40 = (5/2)*y // - (5/2)*y
40-((5/2)*y) = 0
(-5/2)*y+40 = 0
40-5/2*y = 0 // - 40
-5/2*y = -40 // : -5/2
y = -40/(-5/2)
y = 16
y = 16
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