1: -7x – ( -15y ) – ( -2x ) + ( - 6y)
2: 3 6x – 20y + 7z – 8x +20y -11z
3. -4 ( d – 6 )
4 . x + 3 ( 2x – 3y + z ) + 7z
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Answer:
16 fthyfgkd&447&---44.-654
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