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Arte-miy333 [17]
4 years ago
15

Want is the solution? 21 = 42 - 3rA. r = -8B. r = -7 C. r = 7D. r = 8

Mathematics
1 answer:
VMariaS [17]4 years ago
3 0
21 = 42 - 3r
-21 = -3r
r = 7

So C.
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