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2014-11-07T14:48:14+02:00
(8 / (5x+1)) :2 = 21/20
8/(5x+1) * 1/2 =21/20
4/(5x+1)=21/20
5x+1=(4*20)/21
5x+1=100/21
5x=100/21-1    //aducem la acelasi numitor
5x=100/21-21/21
5x=79/21
x=(79/21):5
2 5 2