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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-((x/x)*x) = 1.7 // - 1.7
1-((x/x)*x)-1.7 = 0
1-x-1.7 = 0
-x-0.7 = 0 // + 0.7
-x = 0.7 // * -1
x = -0.7
x = -0.7
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