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D( x )
12*x = 0
3*x^2 = 0
12*x = 0
12*x = 0
12*x = 0 // : 12
x = 0
3*x^2 = 0
3*x^2 = 0
3*x^2 = 0 // : 3
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
7/(12*x)-((x+3)/(3*x^2)) = 0
(-1*(x+3))/(3*x^2)+7/(12*x) = 0
(-1*12*x*(x+3))/(3*12*x*x^2)+(3*7*x^2)/(3*12*x*x^2) = 0
3*7*x^2-1*12*x*(x+3) = 0
9*x^2-36*x = 0
9*x^2-36*x = 0
9*x*(x-4) = 0
x-4 = 0 // + 4
x = 4
9*x*(x-4) = 0
(9*x*(x-4))/(3*12*x*x^2) = 0
(9*x*(x-4))/(3*12*x*x^2) = 0 // * 3*12*x*x^2
9*x*(x-4) = 0
( 9*x )
9*x = 0 // : 9
x = 0
( x-4 )
x-4 = 0 // + 4
x = 4
x in { 0}
x = 4
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