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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x-7)/x = (x-3)/4 // - (x-3)/4
(2*x-7)/x-((x-3)/4) = 0
(2*x-7)/x+(-1*(x-3))/4 = 0
(4*(2*x-7))/(4*x)+(-1*x*(x-3))/(4*x) = 0
4*(2*x-7)-1*x*(x-3) = 0
11*x-x^2-28 = 0
11*x-x^2-28 = 0
11*x-x^2-28 = 0
DELTA = 11^2-(-28*(-1)*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)-11)/(-1*2) or x = (-9^(1/2)-11)/(-1*2)
x = 4 or x = 7
(x-4)*(x-7) = 0
((x-4)*(x-7))/(4*x) = 0
((x-4)*(x-7))/(4*x) = 0 // * 4*x
(x-4)*(x-7) = 0
( x-4 )
x-4 = 0 // + 4
x = 4
( x-7 )
x-7 = 0 // + 7
x = 7
x in { 4, 7 }
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