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8_murik_8 [283]
2 years ago
10

Part 2

Mathematics
1 answer:
HACTEHA [7]2 years ago
5 0
It is: No, he is not correct and the correct solution is 10r +10

-2r-5a+12r+10+5a
-5a+10r+10+5a
10r+10
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