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y in (-oo:+oo)
y/4-(1/5) = 0
y/4-1/5 = 0
1/4*y-1/5 = 0 // + 1/5
1/4*y = 1/5 // : 1/4
y = 1/5/1/4
y = 4/5
y = 4/5
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