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x in (-oo:+oo)
x+x-(2/5)+3 = 2*x+7 // - 2*x+7
x+x-(2*x)-(2/5)-7+3 = 0
x+x-2*x-2/5-7+3 = 0
-22/5 = 0
x belongs to the empty set
x belongs to the empty set
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