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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(7) = 5/x // - 5/x
sin(7)-(5/x) = 0
sin(7)-5*x^-1 = 0
-5*x^-1 = -sin(7) // : -5
x^-1 = sin(7)/5
-1 < 0
1/(x^1) = sin(7)/5 // * x^1
1 = (sin(7)/5)*x^1 // : sin(7)/5
5*(sin(7))^-1 = x^1
x = 5*(sin(7))^-1
x = 5*(sin(7))^-1
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