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afla termeni necunoscuti :a+34=62,,,,b- 68=19 ,,28+c=91,,45-d=26,,,,x-(23+48)=18,,y-(78-64)=4,,,, m+(43-27)=52,,,,n-(56-25)=59,,,,63-49+f=71,,,,,,,,,91-36-g=27,,,,,t-(28-9)=16,,,,r-37=26.