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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*(2*x+4)+6*x+(2*x^2)/x = 15*x+3*x+(1/3)*x+1 // - 15*x+3*x+(1/3)*x+1
3*(2*x+4)+6*x+(2*x^2)/x-(15*x)-(3*x)-((1/3)*x)-1 = 0
3*(2*x+4)+6*x+(2*x^2)/x-15*x-3*x+(-1/3)*x-1 = 0
3*(2*x+4)+6*x+2*x-15*x-3*x-x/3-1 = 0
(3^2*(2*x+4))/3+(3*6*x)/3+(2*3*x)/3+(-15*3*x)/3+(-3*3*x)/3-x/3+(-1*3)/3 = 0
3^2*(2*x+4)+3*6*x+2*3*x-15*3*x-3*3*x-x-1*3 = 0
36*x+6*x-45*x-9*x-x-3+36 = 0
42*x-45*x-9*x-x-3+36 = 0
36-3*x-9*x-x-3 = 0
36-12*x-x-3 = 0
36-13*x-3 = 0
33-13*x = 0
(33-13*x)/3 = 0
(33-13*x)/3 = 0 // * 3
33-13*x = 0
33-13*x = 0 // - 33
-13*x = -33 // : -13
x = -33/(-13)
x = 33/13
x = 33/13
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