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D( x )
10*x = 0
5*x = 0
10*x = 0
10*x = 0
10*x = 0 // : 10
x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
(3*x+12)/(5*x) = (x+4)/(10*x) // - (x+4)/(10*x)
(3*x+12)/(5*x)-((x+4)/(10*x)) = 0
(3*x+12)/(5*x)+(-1*(x+4))/(10*x) = 0
(10*x*(3*x+12))/(5*10*x*x)+(-1*5*x*(x+4))/(5*10*x*x) = 0
10*x*(3*x+12)-1*5*x*(x+4) = 0
25*x^2+100*x = 0
25*x^2+100*x = 0
25*x*(x+4) = 0
x+4 = 0 // - 4
x = -4
25*x*(x+4) = 0
(25*x*(x+4))/(5*10*x*x) = 0
(25*x*(x+4))/(5*10*x*x) = 0 // * 5*10*x*x
25*x*(x+4) = 0
( 25*x )
25*x = 0 // : 25
x = 0
( x+4 )
x+4 = 0 // - 4
x = -4
x in { 0}
x = -4
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