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x in (-oo:+oo)
x+4/4 = x+7/2-(8/7) // - x+7/2-(8/7)
x-x+4/4-(7/2)+8/7 = 0
x-x+4/4-7/2+8/7 = 0
-19/14 = 0
x belongs to the empty set
x belongs to the empty set
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