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This is the problem when trying to describe equations: it's nearly impossible, and certainly not normally done without also displaying the actual equations. Why do you need this information?

For your equation, you could try:

Y equals three times T to the power of five, [pause] multiplied by [pause] X to the power of seven, over four.

But when things get this complicated, I say use a projector or a flipchart.

Thank you very much, rewboss, for kindly answering me.
I'm Japanese but an English teacher.;-) I have to read aloud in front of my students. Sometimes there are equations in text books. I want to get accoustomed to them. Compared to Japanese, the way to pronouce them is more complicated.