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