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