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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x+4*y = 10 // - 10
3/x+4*y-10 = 0
3*x^-1 = -(4*y-10) // : 3
x^-1 = (10-(4*y))/3
-1 < 0
1/(x^1) = (10-(4*y))/3 // * x^1
1 = x^1*((10-(4*y))/3) // : (10-(4*y))/3
3*(10-4*y)^-1 = x^1
x = 3*(10-4*y)^-1
x = 3*(10-4*y)^-1
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