book Maths Puzzle Numerical Ability

what is and how i solve it please with a cherry on top!!!!

2x-3
_____ =4/7
4x-5

Rachel

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book Other Question

______8______
5^1/2 + 3^1/2 A math teacher is randomly distributing 15 rulers with centimeter laables and 10 rulers without centimeter labels. What is the probability that the first ruler she hands out will have centimeter labels and the second ruler will not have labels?