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D( x )
3*x = 0
x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-(7/16) = 2/(3*x) // - 2/(3*x)
6/x-(2/(3*x))-(7/16) = 0
6/x+(-2/3)*x^-1-7/16 = 0
16/3*x^-1 = 7/16 // : 16/3
x^-1 = 21/256
-1 < 0
1/(x^1) = 21/256 // * x^1
1 = 21/256*x^1 // : 21/256
256/21 = x^1
x = 256/21
x = 256/21
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