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2014-09-21T13:08:00+03:00

  d divide (7x+11)  ⇒ d divide 2(7x+11) = 14x+22

  d divide ((2x+1)  ⇒ d divide 7 (2x+1) = 14x +7⇒d divide 15 ⇒d=(2x+1)=15 ⇒x=7

2 3 2