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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(12/x) = 7 // - 7
x-(12/x)-7 = 0
x-12*x^-1-7 = 0
1*x^1-12*x^-1-7*x^0 = 0
(1*x^2-7*x^1-12*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-7*x^1-12*x^0) = 0
x^1
x^2-7*x-12 = 0
x^2-7*x-12 = 0
DELTA = (-7)^2-(-12*1*4)
DELTA = 97
DELTA > 0
x = (97^(1/2)+7)/(1*2) or x = (7-97^(1/2))/(1*2)
x = (97^(1/2)+7)/2 or x = (7-97^(1/2))/2
x in { (7-97^(1/2))/2, (97^(1/2)+7)/2}
x in { (7-97^(1/2))/2, (97^(1/2)+7)/2 }
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