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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-(7/5)+2 = 0
6/x-7/5+2 = 0
6*x^-1 = -3/5 // : 6
x^-1 = -1/10
-1 < 0
1/(x^1) = -1/10 // * x^1
1 = -1/10*x^1 // : -1/10
-10 = x^1
x = -10
x = -10
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