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2014-10-03T20:40:43+03:00
X+1=-4
x=-4-1
x=-5

2x=2
x= \frac{2}{2}
x=1

 \frac{2x+1}{2} =5
2x+1=5*2
2x+1=10
2x=10-1
2x=9
x= \frac{2}{9}