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