If log x - log (2x - 1) = 1, the value of x is : 1. 19/10 2. 19 × 10 3. 10/19 4. 1/19 × 10

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If log₂ (log₃ x) = 4, the value of x is :
3¹⁶
16³
3 × 16
16 ÷ 3

If log (5x - 4) - log (x + 1) = log 4, the value of x is :
6
8
4
12