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I have posted a link there to this topic so the OP can view my work.Can someone help me please?

Question: The term independent of x in the expansion of ((3x^2) - (t/x))^6 is 2160.

Given that t > 0, find the value of t.

Solution so far:

Formula - (n r) ((x)^n-r) ((y)^r)

So:

(6 r) ((3x^2)^6-r) (-t/x)^r

However, I don't know where to go from here. I am supposed to get:

x^12-3r

and then from that I am supposed to get r = 4

and then t = 2