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D( x )
x-0.05 = 0
x-0.05 = 0
x-0.05 = 0
x-0.05 = 0 // + 0.05
x = 0.05
x in (-oo:0.05) U (0.05:+oo)
(35-5)/(20-5) = (0.05-0.2)/(x-0.05) // - (0.05-0.2)/(x-0.05)
(35-5)/(20-5)-((0.05-0.2)/(x-0.05)) = 0
(-1*(-0.15))/(x-0.05)+2 = 0
(-1*(-0.15))/(x-0.05)+(2*(x-0.05))/(x-0.05) = 0
2*(x-0.05)-1*(-0.15) = 0
2*x+0.05 = 0
(2*x+0.05)/(x-0.05) = 0
(2*x+0.05)/(x-0.05) = 0 // * x-0.05
2*x+0.05 = 0
2*x+0.05 = 0 // - 0.05
2*x = -0.05 // : 2
x = -0.05/2
x = -0.025
x = -0.025
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