exam Maths Puzzle Numerical Ability

7 radical 6x - 12 radical 6x

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Please help me solve this problem. I am stumped on what to do.
Thank-you!!!

15(23-4x2)3rd power divided by(3x25)
3x+6y=9
4x+5y=15
x-y+4=0
5x+15+5y=10x
2x+2y-4=x+5

Examples that my teacher gave me to help me out, but i still don't understand. so can you please hel