book Maths Puzzle Numerical Ability

RATIONAL THE DENOMINATOR

3 SQUARE ROOT DIVIDED BY 6 SQR ROOT + 3 SQR ROOT

3 SQR ROOT DIVIDED BY 4 3SQR ROOT - 5

ASLO:

SOLVE:

3X SQR ROOT-1 -3=5

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book Other Question

simplify:

6 over 2x-12 minus 20 over x^2-4x-12

Please explain in detail so I understand Thanks.
2x-15/6=x/9+3x/4