exam Maths Puzzle Numerical Ability

Im stuck on this problem.
It says solve

12/√(5x+6)=√(2x+5)

Thanks so much

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exam Other Question

solve equation, by making appropriate substitution.

a)x^-2+x^-1-56=0
U=
U^2=

b)x^2/3-x^1/3-12=0
x=
x^2=
how do i find the lateral area of a regular hexagonal pyramid with base edge 10 and lateral edge 13