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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-x+22/9-9 = 0
7*x^-1-1*x^1-59/9*x^0 = 0
(7*x^0-1*x^2-59/9*x^1)/(x^1) = 0 // * x^2
x^1*(7*x^0-1*x^2-59/9*x^1) = 0
x^1
(-59/9)*x-x^2+7 = 0
(-59/9)*x-x^2+7 = 0
DELTA = (-59/9)^2-(-1*4*7)
DELTA = 5749/81
DELTA > 0
x = ((5749/81)^(1/2)-(-59/9))/(-1*2) or x = (-(-59/9)-(5749/81)^(1/2))/(-1*2)
x = ((5749/81)^(1/2)+59/9)/(-2) or x = (59/9-(5749/81)^(1/2))/(-2)
x in { ((5749/81)^(1/2)+59/9)/(-2), (59/9-(5749/81)^(1/2))/(-2)}
x in { ((5749/81)^(1/2)+59/9)/(-2), (59/9-(5749/81)^(1/2))/(-2) }
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