exam Maths Puzzle Numerical Ability

- 2x - 5y = 10

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exam Other Question

find the lowest common denominator of 3/x +7/5x but not adding the fraction? determine the lcd:can you show me step by step so i can finish the rest? thanks!

4 over x^2 - 6x minus 5 over x^2 - 36

7 over 4x^2y^6 plus 1 over 7x^3y^4