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D( x )
20-(2*x) = 0
20-(2*x) = 0
20-(2*x) = 0
20-2*x = 0
20-2*x = 0 // - 20
-2*x = -20 // : -2
x = -20/(-2)
x = 10
x in (-oo:10) U (10:+oo)
Y = (88-(2*x))/(20-(2*x)) // - (88-(2*x))/(20-(2*x))
Y-((88-(2*x))/(20-(2*x))) = 0
Y-((88-2*x)/(20-2*x)) = 0
(-1*(88-2*x))/(20-2*x)+Y = 0
(-1*(88-2*x))/(20-2*x)+(Y*(20-2*x))/(20-2*x) = 0
Y*(20-2*x)-1*(88-2*x) = 0
20*Y-2*Y*x+2*x-88 = 0
(20*Y-2*Y*x+2*x-88)/(20-2*x) = 0
(20*Y-2*Y*x+2*x-88)/(20-2*x) = 0 // * 20-2*x
20*Y-2*Y*x+2*x-88 = 0
20*Y-2*Y*x-88 = 0 // - 20*Y-88
-2*Y*x = -(20*Y-88) // : -2*Y
x = (-(20*Y-88))/(-2*Y)
x = (88-(20*Y))/(-2*Y)
x = (88-(20*Y))/(-2*Y)
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