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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((9.8*x)/15)*(1-((e^-135)/x)) = 0
0.65333333*1*x = 0
0.65333333*x = 0 // : 0.65333333
x = 0
x in { 0}
x belongs to the empty set
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