Answers:
this is the homeschooling section
-7-x-(y+z) first cahnge it to +7+x=7x then 7x-y+z change minus to + and You get 7xyz
y + z = 7 + x
1. Distribute the negative.
-7-x-y-z
That's all you can do.
This is not really a well thought out math question.
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