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D( x )
3-(4*x) = 0
4*x-3 = 0
3-(4*x) = 0
3-(4*x) = 0
3-4*x = 0
3-4*x = 0 // - 3
-4*x = -3 // : -4
x = -3/(-4)
x = 3/4
4*x-3 = 0
4*x-3 = 0
4*x-3 = 0 // + 3
4*x = 3 // : 4
x = 3/4
x in (-oo:3/4) U (3/4:+oo)
x/(3-(4*x))+(5*x)/(4*x-3) = 0
x/(3-4*x)+(5*x)/(4*x-3) = 0
(x*(4*x-3))/((3-4*x)*(4*x-3))+(5*x*(3-4*x))/((3-4*x)*(4*x-3)) = 0
x*(4*x-3)+5*x*(3-4*x) = 0
12*x-16*x^2 = 0
12*x-16*x^2 = 0
4*x*(3-4*x) = 0
3-4*x = 0 // - 3
-4*x = -3 // : -4
x = -3/(-4)
x = 3/4
4*x*(x-3/4) = 0
(4*x*(x-3/4))/((3-4*x)*(4*x-3)) = 0
(4*x*(x-3/4))/((3-4*x)*(4*x-3)) = 0 // * (3-4*x)*(4*x-3)
4*x*(x-3/4) = 0
( 4*x )
4*x = 0 // : 4
x = 0
( x-3/4 )
x-3/4 = 0 // + 3/4
x = 3/4
x in { 3/4}
x = 0
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