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x in (-oo:+oo)
x+5/10 = x+4/5-(5/7) // - x+4/5-(5/7)
x-x+5/10-(4/5)+5/7 = 0
x-x+5/10-4/5+5/7 = 0
29/70 = 0
x belongs to the empty set
x belongs to the empty set
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