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= 3^(x + 4) . 5^(x + 1) . 3^(2x - 1) . 5^(2x - 1)
= 3^(x + 4 + 2x - 1) / 5^(x + 1 + 2x - 1)
= 3^(3x + 3) . 5^(3x)