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qwelly [4]
3 years ago
8

Need help on this almost done

Mathematics
1 answer:
Margarita [4]3 years ago
5 0

Step-by-step explanation:

As shown in the picture, 3(x + 7) = (x + 7) + (2x - 7) + x.

So 3x + 21 = 4x. This means that x = 21.

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