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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/y-(7/10) = -6/5 // + -6/5
3/y-(7/10)-(-6/5) = 0
3/y-7/10+6/5 = 0
3*y^-1 = -1/2 // : 3
y^-1 = -1/6
-1 < 0
1/(y^1) = -1/6 // * y^1
1 = -1/6*y^1 // : -1/6
-6 = y^1
y = -6
y = -6
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