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x in (-oo:+oo)
x+7/10 = x+6/5-(5/4) // - x+6/5-(5/4)
x-x+7/10-(6/5)+5/4 = 0
x-x+7/10-6/5+5/4 = 0
3/4 = 0
x belongs to the empty set
x belongs to the empty set
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