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D( y )
2*y-7 = 0
2*y-7 = 0
2*y-7 = 0
2*y-7 = 0 // + 7
2*y = 7 // : 2
y = 7/2
y in (-oo:7/2) U (7/2:+oo)
5/(2*y-7) = -1 // + 1
5/(2*y-7)+1 = 0
5/(2*y-7)+(1*(2*y-7))/(2*y-7) = 0
1*(2*y-7)+5 = 0
2*y-2 = 0
(2*y-2)/(2*y-7) = 0
(2*y-2)/(2*y-7) = 0 // * 2*y-7
2*y-2 = 0
2*y-2 = 0 // + 2
2*y = 2 // : 2
y = 2/2
y = 1
y = 1
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