In class, the teacher gave you such a question: "known 5a-2x + 3 = 0, 4b-7x-21 = 0 If a is less than 6 and less than or equal to B, find the value range of X

If 5a-2x + 3 = 0, then a = (2x-3) / 5
If 4b-7x-21 = 0, then B = (7x + 21) / 4
∴ (2x-3)/5

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