Let t be the number of bags Trisha brought.
Sal brought 12 * 4 = <<12*4=48>>48 clementines.
Joe brought 12 * 6 = <<12*6=72>>72 clementines.
180 = 48 + 72 + t * 12.
180 = 120 + t * 12.
60 = t * 12.
t = <<5=5>>5. Answer: \boxed{5}.
Bags of clementines have 12 each. For the party, Sal, Trisha, and Joe each brought bags of clementines. Altogether, there were 180 clementines. Sal brought 4 bags and Joe brought 6. Write the equation to determine how many bags Trisha brought, t.
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