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2014-06-24T18:42:45+03:00
x⇒8
x+1⇒8+1=9
x+2⇒8+2=10
x+3⇒8+3=11
x+4⇒8+4=12                 10·11·12=1320


x+x+1+x+2+x+3+x+4=50
5x+10=50
5x=50-10
5x=40
x=40/5
x=8


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