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D( x )
2*x-7 = 0
2*x-7 = 0
2*x-7 = 0
2*x-7 = 0 // + 7
2*x = 7 // : 2
x = 7/2
x in (-oo:7/2) U (7/2:+oo)
2*x-7 = 4/(2*x-7) // - 4/(2*x-7)
2*x-(4/(2*x-7))-7 = 0
2*x-4*(2*x-7)^-1-7 = 0
2*x-4/(2*x-7)-7 = 0
(2*x*(2*x-7))/(2*x-7)-4/(2*x-7)+(-7*(2*x-7))/(2*x-7) = 0
2*x*(2*x-7)-7*(2*x-7)-4 = 0
4*x^2-14*x-14*x-4+49 = 0
4*x^2-28*x+45 = 0
4*x^2-28*x+45 = 0
4*x^2-28*x+45 = 0
DELTA = (-28)^2-(4*4*45)
DELTA = 64
DELTA > 0
x = (64^(1/2)+28)/(2*4) or x = (28-64^(1/2))/(2*4)
x = 9/2 or x = 5/2
(x-5/2)*(x-9/2) = 0
((x-5/2)*(x-9/2))/(2*x-7) = 0
((x-5/2)*(x-9/2))/(2*x-7) = 0 // * 2*x-7
(x-5/2)*(x-9/2) = 0
( x-5/2 )
x-5/2 = 0 // + 5/2
x = 5/2
( x-9/2 )
x-9/2 = 0 // + 9/2
x = 9/2
x in { 5/2, 9/2 }
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