Suppose that $\Join$ is an operation defined by $x \Join y = (x+2)(y-3)$. What is $((t) \Join (t+2)) - ((t+1) \Join (t+1))$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Suppose that $\Join$ is an operation defined by $x \Join y = (x+2)(y-3)$. What is $((t) \Join (t+2)) - ((t+1) \Join (t+1))$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
4
Suppose that $\Join$ is an operation defined by $x \Join y = (x+2)(y-3)$. What is $((t) \Join (t+2)) - ((t+1) \Join (t+1))$?
train