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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
11/y-(13/70) = 0
11/y-13/70 = 0
11*y^-1 = 13/70 // : 11
y^-1 = 13/770
-1 < 0
1/(y^1) = 13/770 // * y^1
1 = 13/770*y^1 // : 13/770
770/13 = y^1
y = 770/13
y = 770/13
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