exam Maths Puzzle Numerical Ability

I need help with a question that says: solve each of the following for x
*1/8=4^(6x+2)
*(1/4)^x=256
*log10x=4

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exam Other Question
One number is 3 times another. If the sum of their reciprocals is 4/21, find the two numbers.

I think I can solve the equation if I could figure out how to set it up.

Thanks please help me solve this equation
Find the LCM
5(z-3)and 15(z-3)