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D( x )
x+28 = 0
x+28 = 0
x+28 = 0
x+28 = 0 // - 28
x = -28
x in (-oo:-28) U (-28:+oo)
29.53 = 1329/(x+28) // - 1329/(x+28)
29.53-(1329/(x+28)) = 0
29.53-1329*(x+28)^-1 = 0
29.53-1329/(x+28) = 0
(29.53*(x+28))/(x+28)-1329/(x+28) = 0
29.53*(x+28)-1329 = 0
29.53*x-502.16 = 0
(29.53*x-502.16)/(x+28) = 0
(29.53*x-502.16)/(x+28) = 0 // * x+28
29.53*x-502.16 = 0
29.53*x-502.16 = 0 // + 502.16
29.53*x = 502.16 // : 29.53
x = 502.16/29.53
x = 17.00507958
x = 17.00507958
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