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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x+8 = y/7 // - y/7
x/x-(y/7)+8 = 0
9-1/7*y = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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