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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7-(2*x)-x-(x/x)-(5/5)-5 = 0
7-2*x-x-5-1-1 = 0
-3*x = 0 // : -3
x = 0
x in { 0}
x belongs to the empty set
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