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D( x )
63*x^2+54*x = 0
63*x^2+54*x = 0
63*x^2+54*x = 0
63*x^2+54*x = 0
DELTA = 54^2-(0*4*63)
DELTA = 2916
DELTA > 0
x = (2916^(1/2)-54)/(2*63) or x = (-2916^(1/2)-54)/(2*63)
x = 0 or x = -6/7
x in (-oo:-6/7) U (-6/7:0) U (0:+oo)
(63*x^2-(81*x))/(63*x^2+54*x) = 0
(63*x^2-81*x)/(63*x^2+54*x) = 0
63*x^2-81*x = 0
9*x*(7*x-9) = 0
7*x-9 = 0 // + 9
7*x = 9 // : 7
x = 9/7
9*x*(x-9/7) = 0
63*x^2+54*x = 0
9*x*(7*x+6) = 0
7*x+6 = 0 // - 6
7*x = -6 // : 7
x = -6/7
9*x*(x+6/7) = 0
(9*x*(x-9/7))/(9*x*(x+6/7)) = 0
( 9*x )
9*x = 0 // : 9
x = 0
( x-9/7 )
x-9/7 = 0 // + 9/7
x = 9/7
x in { 0}
x = 9/7
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