book Maths Puzzle Numerical Ability

I am supposed to solve for x by graphing solution on a number line:

1/3 (absolute value vertical line) 2x-1 (absolute value vertical line) (greater than/equal to symbol) 4

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book Other Question

(1) lizzie had two amounts of pens. the product of these 2 amounts proved to be 126. one factor is 3 greater than 3 times the other. what are the 2 amounts of pens she has? of 200 coins, 199 are the same weight and ine is lighter than the others. Given the same balance, explain how the lighter coin may be indentfied in no more than 5 weighings.