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x in (-oo:+oo)
2*x+5/5 = 3*x-x+1/2+7/2 // - 3*x-x+1/2+7/2
2*x-(3*x)+x+5/5-(1/2)-(7/2) = 0
2*x-3*x+x+5/5-1/2-7/2 = 0
-3 = 0
x belongs to the empty set
x belongs to the empty set
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