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D( x )
0.1223-x = 0
0.1223-x = 0
0.1223-x = 0
0.1223-x = 0 // - 0.1223
-x = -0.1223 // * -1
x = 0.1223
x in (-oo:0.1223) U (0.1223:+oo)
70 = (2.73*(x+1))/(0.1223-x) // - (2.73*(x+1))/(0.1223-x)
70-((2.73*(x+1))/(0.1223-x)) = 0
70-2.73*(x+1)*(0.1223-x)^-1 = 0
(-2.73*(x+1))/(0.1223-x)+70 = 0
(-2.73*(x+1))/(0.1223-x)+(70*(0.1223-x))/(0.1223-x) = 0
70*(0.1223-x)-2.73*(x+1) = 0
5.831-72.73*x = 0
(5.831-72.73*x)/(0.1223-x) = 0
(5.831-72.73*x)/(0.1223-x) = 0 // * 0.1223-x
5.831-72.73*x = 0
5.831-72.73*x = 0 // - 5.831
-72.73*x = -5.831 // : -72.73
x = -5.831/(-72.73)
x = 0.08017324
x = 0.08017324
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