9 Tens is the same as 6 times?

If you had "9 Tens" (10 10 10 10 10 10 10 10 10) in mind, then you'd probably said "9 times 10"; thus, I assume that your question is:
"9 Tenths" which would be 9 / 10 equals 6 times x.

6x = 9 / 10 | Divide by 6
x = (9 / 10) / (6 / 1) | Divisions of fractions equal multiplication with the inverse fraction
x = (9 / 10) * (1 / 6)
x = 9 / 60
x = 3 / 20

And
6 * (3 / 20) = 18 / 20 = 9 / 10
That's it.