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y in (-oo:+oo)
4*y = 9/5 // - 9/5
4*y-(9/5) = 0
4*y-9/5 = 0
4*y-9/5 = 0 // + 9/5
4*y = 9/5 // : 4
y = 9/5/4
y = 9/20
y = 9/20
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