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D( x )
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
4/(2*x-5)-((7/4)*(2*x-5)) = 0
4/(2*x-5)+(-7/4)*(2*x-5) = 0
4/(2*x-5)-7/4*(2*x-5) = 0
4/(2*x-5)+(-7/4*(2*x-5)^2)/(2*x-5) = 0
4-7/4*(2*x-5)^2 = 0
35*x-7*x^2-159/4 = 0
35*x-7*x^2-159/4 = 0
35*x-7*x^2-159/4 = 0
DELTA = 35^2-(-159/4*(-7)*4)
DELTA = 112
DELTA > 0
x = (112^(1/2)-35)/(-7*2) or x = (-112^(1/2)-35)/(-7*2)
x = (4*7^(1/2)-35)/(-14) or x = (-4*7^(1/2)-35)/(-14)
(x-((4*7^(1/2)-35)/(-14)))*(x-((-4*7^(1/2)-35)/(-14))) = 0
((x-((4*7^(1/2)-35)/(-14)))*(x-((-4*7^(1/2)-35)/(-14))))/(2*x-5) = 0
((x-((4*7^(1/2)-35)/(-14)))*(x-((-4*7^(1/2)-35)/(-14))))/(2*x-5) = 0 // * 2*x-5
(x-((4*7^(1/2)-35)/(-14)))*(x-((-4*7^(1/2)-35)/(-14))) = 0
( x-((-4*7^(1/2)-35)/(-14)) )
x-((-4*7^(1/2)-35)/(-14)) = 0 // + (-4*7^(1/2)-35)/(-14)
x = (-4*7^(1/2)-35)/(-14)
( x-((4*7^(1/2)-35)/(-14)) )
x-((4*7^(1/2)-35)/(-14)) = 0 // + (4*7^(1/2)-35)/(-14)
x = (4*7^(1/2)-35)/(-14)
x in { (-4*7^(1/2)-35)/(-14), (4*7^(1/2)-35)/(-14) }
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