How to solve this Question?

:

1/z+ 1/y+ 1/x + 1/w + 1/v + 1/t + 1/s = 1

1/z means 1 over z a fraction.

The letters can be any number.

How to find seven numbers that fit into the equation?

(the numerator is always 1)

What if its 8 sets or 9 sets of fraction? is there any technique?