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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)
34.97 = 1329/(x+28) // - 1329/(x+28)
34.97-(1329/(x+28)) = 0
34.97-1329*(x+28)^-1 = 0
34.97-1329/(x+28) = 0
(34.97*(x+28))/(x+28)-1329/(x+28) = 0
34.97*(x+28)-1329 = 0
34.97*x-349.84 = 0
(34.97*x-349.84)/(x+28) = 0
(34.97*x-349.84)/(x+28) = 0 // * x+28
34.97*x-349.84 = 0
34.97*x-349.84 = 0 // + 349.84
34.97*x = 349.84 // : 34.97
x = 349.84/34.97
x = 10.00400343
x = 10.00400343
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