2,5*[14-7,5:(0,25+14)]=
2,5*[14-7,5:14,25] =
25/10*[14-75/10:1425/100] =
25/10*[14-75/10*100/1425] =
25/10*[14-10/19] amplificam pe 14 cu 19
25/10*[266/19-10/19] =
25/10*256/19 = 3200/95 = 640/19
