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D( x )
2.9-x = 0
2.9-x = 0
2.9-x = 0
2.9-x = 0 // - 2.9
-x = -2.9 // * -1
x = 2.9
x in (-oo:2.9) U (2.9:+oo)
X/(2.9-x) = 1.5 // - 1.5
X/(2.9-x)-1.5 = 0
X/(2.9-x)+(-1.5*(2.9-x))/(2.9-x) = 0
X-1.5*(2.9-x) = 0
X+1.5*x-4.35 = 0
(X+1.5*x-4.35)/(2.9-x) = 0
(X+1.5*x-4.35)/(2.9-x) = 0 // * 2.9-x
X+1.5*x-4.35 = 0
X+1.5*x-4.35 = 0 // - X-4.35
1.5*x = -(X-4.35) // : 1.5
x = (-(X-4.35))/1.5
x = 0.66666667*(4.35-X)
x = 0.66666667*(4.35-X)
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