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x in (-oo:+oo)
x-x-(2/5)-(3/4) = -1/20 // + -1/20
x-x-(2/5)-(3/4)-(-1/20) = 0
x-x-2/5-3/4+1/20 = 0
-11/10 = 0
x belongs to the empty set
x belongs to the empty set
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