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D( x )
35-(((5*x)/3)*x) = 0
x = 0
35-(((5*x)/3)*x) = 0
35-(((5*x)/3)*x) = 0
(-5/3)*x^2+35 = 0
-5/3*x^2 = -35 // : -5/3
x^2 = 21
x^2 = 21 // ^ 1/2
abs(x) = 21^(1/2)
x = 21^(1/2) or x = -21^(1/2)
x = 0
x = 0
x in (-oo:-21^(1/2)) U (-21^(1/2):0) U (0:21^(1/2)) U (21^(1/2):+oo)
(49-((x^2)/x))/(35-(((5*x)/3)*x)) = 0
(49-x)/((-5/3)*x^2+35) = 0
(49-x)/(35-5/3*x^2) = 0
49-x = 0 // - 49
-x = -49 // * -1
x = 49
x = 49
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