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4/2-x+1 = x-(2*x)+4/4+7/8 // - x-(2*x)+4/4+7/8
2*x-x-x+4/2-(4/4)-(7/8)+1 = 0
2*x-x-x+4/2-7/8-1+1 = 0
9/8 = 0
x belongs to the empty set
x belongs to the empty set
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