y=x-4; = y=-6+x. 5x+y=9, ) 9 ) x-y=1; (3 x+y=1, 2) x+y=5; 3) y-6x=-25, y-x=-5; y+7x=-18, 4) y+x=0 - x + 20 y=37, (y-8x=-33,
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Ответы на вопрос:
1. washes
2. drank
3. is studying
4. took/was ringing
5. has traveled
6. has been working
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