exam Maths Puzzle Numerical Ability

Will someone help me add this expression. Step by step would be nice! Thanks in advance!

4y/y^2+6y+5+2y/y^2-1

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exam Other Question

Rewrite the middle term as the sum of two terms and then factor completely

15X^2-21x+6

Thank you A painter can do a given job in 6 hours. Her helper can do the same job in 10 hours. The painter begins the work and after two hours is joined by the helper. In how many hours will they complete the job?