exam Maths Puzzle Numerical Ability

how do i solve this two column proof?
2(3x-8) = 2/3x + 16

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exam Other Question

All three sides of the triangle have equal length. One side is 9x - 4 and another is 2(3x + 4). What is the perimeter? In how many zeroes does 127! end? (Note: 127! means 127(126)(125)...(1)).