book Maths Puzzle Numerical Ability

how do you simplify?

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book Other Question

A total of 40 brand X television sets and 80 brand Y television sets were purchased for a motel chain. If the price of each brand Y set was twice the price of each brand X set, wha I'm having a hard time on this one. Can someone please help me solve it?

3^4x+5 = 9
That is 3 raised to the power 4x + 5 equals 9 - Solve for X

Thank you