book Maths Puzzle Numerical Ability

Simplify: 25a^4 - 25b^4 / 5a^4 - 5b^4

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book Other Question

What are the steps to solve for the domain of F contains all reall number x except x=_________ from the problem f(x)= (7x+7)/(5x+8)? 60=2h-7+2h+7