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D( x )
x = 0
x+30 = 0
x = 0
x = 0
x+30 = 0
x+30 = 0
x+30 = 0 // - 30
x = -30
x in (-oo:-30) U (-30:0) U (0:+oo)
14/(x+30) = 2/x // - 2/x
14/(x+30)-(2/x) = 0
14/(x+30)-2*x^-1 = 0
14/(x+30)-2/x = 0
(14*x)/(x*(x+30))+(-2*(x+30))/(x*(x+30)) = 0
14*x-2*(x+30) = 0
12*x-60 = 0
(12*x-60)/(x*(x+30)) = 0
(12*x-60)/(x*(x+30)) = 0 // * x*(x+30)
12*x-60 = 0
12*x-60 = 0 // + 60
12*x = 60 // : 12
x = 60/12
x = 5
x = 5
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