Subtract the sum of 3x-6y +z and -x+4y-z from x-y+7z.
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Answer:
3(x-3y+3z)
Step-by-step explanation:
3x-6y+z
+ -x+4y-z
+ - + [changing sign of all numbers]
= 4x-10y+2z
- x - y + 7z
= 3x-9y+9z = 3(x-3y+3z) answer............
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