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D( x )
2*x-16 = 0
2*x-16 = 0
2*x-16 = 0
2*x-16 = 0 // + 16
2*x = 16 // : 2
x = 16/2
x = 8
x in (-oo:8) U (8:+oo)
(15*x-120)/(2*x-16)+(x-8)/2 = -1/2 // + -1/2
(15*x-120)/(2*x-16)+(x-8)/2-(-1/2) = 0
(15*x-120)/(2*x-16)+(x-8)/2+1/2 = 0
(2*(15*x-120))/(2*(2*x-16))+((x-8)*(2*x-16))/(2*(2*x-16))+(1*(2*x-16))/(2*(2*x-16)) = 0
2*(15*x-120)+(x-8)*(2*x-16)+1*(2*x-16) = 0
2*x^2-2*x+2*x-112-16 = 0
2*x^2-128 = 0
(2*x^2-128)/(2*(2*x-16)) = 0
(2*x^2-128)/(2*(2*x-16)) = 0 // * 2*(2*x-16)
2*x^2-128 = 0
2*x^2 = 128 // : 2
x^2 = 64
x^2 = 64 // ^ 1/2
abs(x) = 8
x = 8 or x = -8
x in { 8}
x = -8
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