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y in (-oo:+oo)
y/4 = 2.25-y // - 2.25-y
y/4+y-2.25 = 0
5/4*y-2.25 = 0 // + 2.25
5/4*y = 2.25 // : 5/4
y = 2.25/5/4
y = 1.8
y = 1.8
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