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D( x )
4-x = 0
4-x = 0
4-x = 0
4-x = 0 // - 4
-x = -4 // * -1
x = 4
x in (-oo:4) U (4:+oo)
X/(4-x) = 1.58 // - 1.58
X/(4-x)-1.58 = 0
X/(4-x)+(-1.58*(4-x))/(4-x) = 0
X-1.58*(4-x) = 0
X+1.58*x-6.32 = 0
(X+1.58*x-6.32)/(4-x) = 0
(X+1.58*x-6.32)/(4-x) = 0 // * 4-x
X+1.58*x-6.32 = 0
X+1.58*x-6.32 = 0 // - X-6.32
1.58*x = -(X-6.32) // : 1.58
x = (-(X-6.32))/1.58
x = 0.63291139*(6.32-X)
x = 0.63291139*(6.32-X)
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