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y in (-oo:+oo)
5 = y/1.25 // - y/1.25
5-(y/1.25) = 0
5-0.8*y = 0
5-0.8*y = 0 // - 5
-0.8*y = -5 // : -0.8
y = -5/(-0.8)
y = 6.25
y = 6.25
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