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D( x )
x^2-(2*x)-((35/10)*x) = 0
x^2-(2*x)-((35/10)*x) = 0
x^2-(2*x)-((35/10)*x) = 0
x^2-2*x+(-7/2)*x = 0
x^2-11/2*x = 0
DELTA = (-11/2)^2-(0*1*4)
DELTA = 121/4
DELTA > 0
x = ((121/4)^(1/2)+11/2)/(1*2) or x = (11/2-(121/4)^(1/2))/(1*2)
x = 11/2 or x = 0
x in (-oo:0) U (0:11/2) U (11/2:+oo)
(3*x^2-(((21*x)/5)*x^2))/(x^2-(2*x)-((35/10)*x)) = 0
((-21/5)*x^3+3*x^2)/(x^2-2*x+(-7/2)*x) = 0
(3*x^2-21/5*x^3)/(x^2-11/2*x) = 0
3*x^2-21/5*x^3 = 0
3*x^2*(1-7/5*x) = 0
1-7/5*x = 0 // - 1
-7/5*x = -1 // : -7/5
x = -1/(-7/5)
x = 5/7
3*x^2*(x-5/7) = 0
x^2-11/2*x = 0
x*(x-11/2) = 0
x-11/2 = 0 // + 11/2
x = 11/2
x*(x-11/2) = 0
(3*x^2*(x-5/7))/(x*(x-11/2)) = 0
( 3*x^2 )
3*x^2 = 0 // : 3
x^2 = 0
x = 0
( x-5/7 )
x-5/7 = 0 // + 5/7
x = 5/7
x in { 0}
x = 5/7
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