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D( x )
2*x+8 = 0
2*x+8 = 0
2*x+8 = 0
2*x+8 = 0 // - 8
2*x = -8 // : 2
x = -8/2
x = -4
x in (-oo:-4) U (-4:+oo)
5/12 = x/(2*x+8) // - x/(2*x+8)
5/12-(x/(2*x+8)) = 0
(-1*x)/(2*x+8)+5/12 = 0
(-1*12*x)/(12*(2*x+8))+(5*(2*x+8))/(12*(2*x+8)) = 0
5*(2*x+8)-1*12*x = 0
40-2*x = 0
(40-2*x)/(12*(2*x+8)) = 0
(40-2*x)/(12*(2*x+8)) = 0 // * 12*(2*x+8)
40-2*x = 0
40-2*x = 0 // - 40
-2*x = -40 // : -2
x = -40/(-2)
x = 20
x = 20
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