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Answer:
2. 4x = 7x - 21
Step-by-step explanation:
[tex]4x = 7(x - 3) \\ 4x = 7x - 21 \\ 21 = 7x - 4x \\ 21 = 3x \\ \frac{21}{3} = x \\ 7 = x \\ [/tex]