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D( x )
15*x-30 = 0
15*x-30 = 0
15*x-30 = 0
15*x-30 = 0 // + 30
15*x = 30 // : 15
x = 30/15
x = 2
x in (-oo:2) U (2:+oo)
683.056 = (8*x)/(15*x-30) // - (8*x)/(15*x-30)
683.056-((8*x)/(15*x-30)) = 0
683.056-8*x*(15*x-30)^-1 = 0
(-8*x)/(15*x-30)+683.056 = 0
(-8*x)/(15*x-30)+(683.056*(15*x-30))/(15*x-30) = 0
683.056*(15*x-30)-8*x = 0
10237.84*x-20491.68 = 0
(10237.84*x-20491.68)/(15*x-30) = 0
(10237.84*x-20491.68)/(15*x-30) = 0 // * 15*x-30
10237.84*x-20491.68 = 0
10237.84*x-20491.68 = 0 // + 20491.68
10237.84*x = 20491.68 // : 10237.84
x = 20491.68/10237.84
x = 2.00156283
x = 2.00156283
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