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D( x )
x = 0
7*x = 0
x = 0
x = 0
7*x = 0
7*x = 0
7*x = 0 // : 7
x = 0
x in (-oo:0) U (0:+oo)
(2*x-1)/(7*x) = 7/6-(3/x) // - 7/6-(3/x)
(2*x-1)/(7*x)+3/x-(7/6) = 0
(2*x-1)/(7*x)+3/x-7/6 = 0
(6*x*(2*x-1))/(6*7*x*x)+(3*6*7*x)/(6*7*x*x)+(-7*7*x*x)/(6*7*x*x) = 0
6*x*(2*x-1)-7*7*x*x+3*6*7*x = 0
12*x^2-49*x^2+120*x = 0
120*x-37*x^2 = 0
120*x-37*x^2 = 0
x*(120-37*x) = 0
120-37*x = 0 // - 120
-37*x = -120 // : -37
x = -120/(-37)
x = 120/37
x*(x-120/37) = 0
(x*(x-120/37))/(6*7*x*x) = 0
(x*(x-120/37))/(6*7*x*x) = 0 // * 6*7*x*x
x*(x-120/37) = 0
( x-120/37 )
x-120/37 = 0 // + 120/37
x = 120/37
( x )
x = 0
x in { 0}
x = 120/37
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