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marishachu [46]
3 years ago
8

(08.05)

Mathematics
1 answer:
Readme [11.4K]3 years ago
5 0
The mistake is in step 3:

I: −2m =−12 − 2n
II: 2m = 8 + 8n

the student set both right sides of the equations equal (−12 − 2n = 8 + 8n), but the left sides aren't equal: first equation has -2m, second has +2m so the signs of one of the equations must be inverted first
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