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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y/4+(2*y)/y = 22 // - 22
y/4+(2*y)/y-22 = 0
1/4*y-20 = 0 // + 20
1/4*y = 20 // : 1/4
y = 20/1/4
y = 80
y = 80
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