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"One 3.0-kg paint bucket is hanging by a massless cord from another 3.0-kg paint bucket, also hanging by a massless cord. a) If the buckets are at rest, what is the tension in each cord?"

Here's what I have so far:

I drew a free-body diagram with tension (T) pointing upwards and weight (W) pointing downwards on both buckets.

Then I tried to solve it like this:

Fnet=ma

sum of forces=W-T

W=mg

W=30(9.8)

W=294

T=ma

T=30a

so sum of F=294-30a

but now I have two variables and I'm not sure what to do. I think I'm missing something obvious here, so could somebody help point me in the right direction? Thanks :)