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nika2105 [10]
3 years ago
8

Please help will mark as brainliest

Mathematics
1 answer:
BartSMP [9]3 years ago
5 0

Answer:

40

Step-by-step explanation:

3x + 7 = 5x - 15

2x = 22

x = 11

QC = 51 - x = 51 - 11 = 40

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