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D( x )
5*x+8 = 0
5*x+8 = 0
5*x+8 = 0
5*x+8 = 0 // - 8
5*x = -8 // : 5
x = -8/5
x in (-oo:-8/5) U (-8/5:+oo)
(4*x+8)/(5*x+8) = 5/6 // - 5/6
(4*x+8)/(5*x+8)-(5/6) = 0
(4*x+8)/(5*x+8)-5/6 = 0
(6*(4*x+8))/(6*(5*x+8))+(-5*(5*x+8))/(6*(5*x+8)) = 0
6*(4*x+8)-5*(5*x+8) = 0
8-x = 0
(8-x)/(6*(5*x+8)) = 0
(8-x)/(6*(5*x+8)) = 0 // * 6*(5*x+8)
8-x = 0
8-x = 0 // - 8
-x = -8 // * -1
x = 8
x = 8
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