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WITCHER [35]
3 years ago
8

Need answer ASAP will give brainliest check out the picture

Mathematics
1 answer:
valentinak56 [21]3 years ago
8 0

Answer:

i think... x=6

Step-by-step explanation:

3x+9=x+21

3x−x=12

2x=12

x=6

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