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D( x )
5-(2*x) = 0
5-(2*x) = 0
5-(2*x) = 0
5-2*x = 0
5-2*x = 0 // - 5
-2*x = -5 // : -2
x = -5/(-2)
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
3*x+7 = 4/(5-(2*x)) // - 4/(5-(2*x))
3*x-(4/(5-(2*x)))+7 = 0
3*x-4*(5-2*x)^-1+7 = 0
3*x-4/(5-2*x)+7 = 0
(3*x*(5-2*x))/(5-2*x)-4/(5-2*x)+(7*(5-2*x))/(5-2*x) = 0
3*x*(5-2*x)+7*(5-2*x)-4 = 0
15*x-6*x^2-14*x-4+35 = 0
x-6*x^2+31 = 0
x-6*x^2+31 = 0
x-6*x^2+31 = 0
DELTA = 1^2-(-6*4*31)
DELTA = 745
DELTA > 0
x = (745^(1/2)-1)/(-6*2) or x = (-745^(1/2)-1)/(-6*2)
x = (745^(1/2)-1)/(-12) or x = (745^(1/2)+1)/12
(x-((745^(1/2)-1)/(-12)))*(x-((745^(1/2)+1)/12)) = 0
((x-((745^(1/2)-1)/(-12)))*(x-((745^(1/2)+1)/12)))/(5-2*x) = 0
((x-((745^(1/2)-1)/(-12)))*(x-((745^(1/2)+1)/12)))/(5-2*x) = 0 // * 5-2*x
(x-((745^(1/2)-1)/(-12)))*(x-((745^(1/2)+1)/12)) = 0
( x-((745^(1/2)+1)/12) )
x-((745^(1/2)+1)/12) = 0 // + (745^(1/2)+1)/12
x = (745^(1/2)+1)/12
( x-((745^(1/2)-1)/(-12)) )
x-((745^(1/2)-1)/(-12)) = 0 // + (745^(1/2)-1)/(-12)
x = (745^(1/2)-1)/(-12)
x in { (745^(1/2)+1)/12, (745^(1/2)-1)/(-12) }
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