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122.a) Stiind ca x + 2y + 13 = 24, determinati 18 + 2y + x ;              
       b) Stiind ca 2x + 3y + 17 = 38 , determinati 3y + 29 + 2x .


Răspuns :

x+2y+13=24
x+2y=11
x+2y +18=29
b)2x+3y+17=38
2x+3y=21
2x+3y+29=50