book Maths Puzzle Numerical Ability

In algebra, what do they mean by subset?

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book Other Question

Please help, I don't understand how to work out this problem, please show work if possible.

3^4x+5 = 9

That is 3 raised to the power 4x + 5 equals 9 Thank you for your help.
PLEASE HELP ME WITH THIS EQUATION.

2/5+4/10X+5=7/2X+1