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D( x )
1.5-x = 0
1.5-x = 0
1.5-x = 0
1.5-x = 0 // - 1.5
-x = -1.5 // * -1
x = 1.5
x in (-oo:1.5) U (1.5:+oo)
1.7 = x/(1.5-x) // - x/(1.5-x)
1.7-(x/(1.5-x)) = 0
(-1*x)/(1.5-x)+1.7 = 0
(-1*x)/(1.5-x)+(1.7*(1.5-x))/(1.5-x) = 0
1.7*(1.5-x)-1*x = 0
2.55-2.7*x = 0
(2.55-2.7*x)/(1.5-x) = 0
(2.55-2.7*x)/(1.5-x) = 0 // * 1.5-x
2.55-2.7*x = 0
2.55-2.7*x = 0 // - 2.55
-2.7*x = -2.55 // : -2.7
x = -2.55/(-2.7)
x = 0.94444444
x = 0.94444444
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