exam Maths Puzzle Numerical Ability

Goof day ma'am or sir, I hope you can help me to solve this problem.
What must be the value of x to make this expression not rational or the denominator is equal to zero?
This ex

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3/(-8/27) The directions say, "Simplify each expression." How do you solve the problem r^3t^-7/t^5

I tried dividing the "t"s first. (I though you have to do like terms.) Thanks!