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2014-04-15T11:37:40+03:00
X+2/5x+3
x+2/x+2     x+2/5(x+2)   x+2/5x+5  
                                         x+2/5x+3            x+2/5x+5-5x-3   x+2/2
x+2∈{-2,+2}
x+2∉{-2}  ⇒x+2=2   x=2-2   x=0