Răspuns:
5(x-1)+2(y+1)=2×3 | 5X-5+2Y+2=6=> 5x+2y=6+3=9|
2(4-x)-7(1-y)=13 =>8-2x-7+7y=13=>-2x+7y=13-1=12|
×2=>10x+4y=18
×5=>-10x+35y=60
______________
/39y=78=>y=2
5x+2×2=9=>5x+4=9=>5x=9-4=5=>x=5÷5=1
