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D( y )
7-y = 0
7-y = 0
7-y = 0
7-y = 0 // - 7
-y = -7 // * -1
y = 7
y in (-oo:7) U (7:+oo)
10/(7-y) = 3/6 // - 3/6
10/(7-y)-(3/6) = 0
10/(7-y)-1/2 = 0
(2*10)/(2*(7-y))+(-1*(7-y))/(2*(7-y)) = 0
2*10-1*(7-y) = 0
y+13 = 0
(y+13)/(2*(7-y)) = 0
(y+13)/(2*(7-y)) = 0 // * 2*(7-y)
y+13 = 0
y+13 = 0 // - 13
y = -13
y = -13
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