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D( x )
2*x+4 = 0
2*x+4 = 0
2*x+4 = 0
2*x+4 = 0 // - 4
2*x = -4 // : 2
x = -4/2
x = -2
x in (-oo:-2) U (-2:+oo)
(2-x)/(2*x+4) = 8 // - 8
(2-x)/(2*x+4)-8 = 0
(2-x)/(2*x+4)+(-8*(2*x+4))/(2*x+4) = 0
2-8*(2*x+4)-x = 0
-17*x-30 = 0
(-17*x-30)/(2*x+4) = 0
(-17*x-30)/(2*x+4) = 0 // * 2*x+4
-17*x-30 = 0
-17*x-30 = 0 // + 30
-17*x = 30 // : -17
x = 30/(-17)
x = -30/17
x = -30/17
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