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D( x )
x-3 = 0
7*x+21 = 0
(4*x-32)/(7*x+21) = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
7*x+21 = 0
7*x+21 = 0
7*x+21 = 0 // - 21
7*x = -21 // : 7
x = -21/7
x = -3
(4*x-32)/(7*x+21) = 0
(4*x-32)/(7*x+21) = 0
4*x-32 = 0 // + 32
4*x = 32 // : 4
x = 32/4
x = 8
x in (-oo:-3) U (-3:3) U (3:8) U (8:+oo)
(((4*x)/(x-3))*(x+3))/((4*x-32)/(7*x+21)) = 0
(4*x*(x+3)*(7*x+21))/((x-3)*(4*x-32)) = 0
( 4*x )
4*x = 0 // : 4
x = 0
( 7*x+21 )
7*x+21 = 0 // - 21
7*x = -21 // : 7
x = -21/7
x = -3
( x+3 )
x+3 = 0 // - 3
x = -3
x in { -3}
x = 0
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