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Serhud [2]
3 years ago
13

Please explain step by step

Mathematics
1 answer:
soldi70 [24.7K]3 years ago
7 0

Answer:

23

Step-by-step explanation:

51+(2x+3)=100 ( exterior angle is equal to two opposite interior angles)

51+2x+3=100

2x+54=100

2x=100-54

x=46/2

x=23

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