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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/8 = (17-x)/x // - (17-x)/x
15/8-((17-x)/x) = 0
(-1*(17-x))/x+15/8 = 0
(-1*8*(17-x))/(8*x)+(15*x)/(8*x) = 0
15*x-1*8*(17-x) = 0
23*x-136 = 0
(23*x-136)/(8*x) = 0
(23*x-136)/(8*x) = 0 // * 8*x
23*x-136 = 0
23*x-136 = 0 // + 136
23*x = 136 // : 23
x = 136/23
x = 136/23
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