Step-by-step explanation:
Starting with x = a - 3(20 - 1) = a - 57
We can find 2x-1 and 3x-1 as follows:
2x - 1 = 2(a - 57) - 1 = 2a - 115
3x - 1 = 3(a - 57) - 1 = 3a - 172
Therefore, 2x-1 = 2a - 115 and 3x-1 = 3a - 172 in terms of a.
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