exam Maths Puzzle Numerical Ability

I really need help with this....PLEASE, PLEASE

10ax-5 = 6x+4

PLEASE HELP ME. I don't understand this question

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exam Other Question

Please help solve the following questions from ch. 6 exersie 6.1
thanks,
John What is the simplest form of (3^n)(9^n-2)sqrt4(^4n+2)/4(^2n+1) Note:the 4(^2n+1) is the denominator