exam Maths Puzzle Numerical Ability

Solve by the elimination method.
7r - 4s =24
4r + 7s =88

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exam Other Question

simplifiy -6x2(-2x2)(x2)
and -3x4(-2x2)
Im stuck on this problem.
It says solve

12/√(5x+6)=√(2x+5)

Thanks so much