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Andru [333]
3 years ago
9

Solve for r. 21 = 42 - 3r A. r = -8 B. r = -7 C. r = 7 D. r = 8

Mathematics
2 answers:
sukhopar [10]3 years ago
7 0

Answer:7

Step-by-step explanation:

21=42-3r

21-42=3r

-21=3r

r=7

goblinko [34]3 years ago
7 0

Answer:

-7

Step-by-step explanation:

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