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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
30/16 = (x+16)/(3*x) // - (x+16)/(3*x)
30/16-((x+16)/(3*x)) = 0
(-1*(x+16))/(3*x)+15/8 = 0
(-1*8*(x+16))/(3*8*x)+(3*15*x)/(3*8*x) = 0
3*15*x-1*8*(x+16) = 0
37*x-128 = 0
(37*x-128)/(3*8*x) = 0
(37*x-128)/(3*8*x) = 0 // * 3*8*x
37*x-128 = 0
37*x-128 = 0 // + 128
37*x = 128 // : 37
x = 128/37
x = 128/37
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