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D( x )
x-6 = 0
4*x-24 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
4*x-24 = 0
4*x-24 = 0
4*x-24 = 0 // + 24
4*x = 24 // : 4
x = 24/4
x = 6
x in (-oo:6) U (6:+oo)
-5/(x-6) = 7/(4*x-24)+2 // - 7/(4*x-24)+2
-5/(x-6)-(7/(4*x-24))-2 = 0
-5/(x-6)-7*(4*x-24)^-1-2 = 0
-5/(x-6)-7/(4*x-24)-2 = 0
(-5*(4*x-24))/((x-6)*(4*x-24))+(-7*(x-6))/((x-6)*(4*x-24))+(-2*(x-6)*(4*x-24))/((x-6)*(4*x-24)) = 0
-5*(4*x-24)-7*(x-6)-2*(x-6)*(4*x-24) = 0
96*x-8*x^2-27*x-288+162 = 0
69*x-8*x^2-126 = 0
69*x-8*x^2-126 = 0
69*x-8*x^2-126 = 0
DELTA = 69^2-(-126*(-8)*4)
DELTA = 729
DELTA > 0
x = (729^(1/2)-69)/(-8*2) or x = (-729^(1/2)-69)/(-8*2)
x = 21/8 or x = 6
(x-21/8)*(x-6) = 0
((x-21/8)*(x-6))/((x-6)*(4*x-24)) = 0
((x-21/8)*(x-6))/((x-6)*(4*x-24)) = 0 // * (x-6)*(4*x-24)
(x-21/8)*(x-6) = 0
( x-21/8 )
x-21/8 = 0 // + 21/8
x = 21/8
( x-6 )
x-6 = 0 // + 6
x = 6
x in { 6}
x = 21/8
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