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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y+1/30 = 2/y+5 // - 2/y+5
1/y-(2/y)+1/30-5 = 0
1/y-2*y^-1+1/30-5 = 0
-1*y^-1 = 149/30 // : -1
y^-1 = -149/30
-1 < 0
1/(y^1) = -149/30 // * y^1
1 = -149/30*y^1 // : -149/30
-30/149 = y^1
y = -30/149
y = -30/149
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