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D( x )
7*x-(7*x^2) = 0
7*x-(7*x^2) = 0
7*x-(7*x^2) = 0
7*x-7*x^2 = 0
7*x-7*x^2 = 0
DELTA = 7^2-(-7*0*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)-7)/(-7*2) or x = (-49^(1/2)-7)/(-7*2)
x = 0 or x = 1
x in (-oo:0) U (0:1) U (1:+oo)
(32-(16*x))/(7*x-(7*x^2)) = 0
(32-16*x)/(7*x-7*x^2) = 0
7*x-7*x^2 = 0
7*x*(1-x) = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
7*x*(x-1) = 0
(32-16*x)/(7*x*(x-1)) = 0
32-16*x = 0 // - 32
-16*x = -32 // : -16
x = -32/(-16)
x = 2
x = 2
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