If $A\ \spadesuit\ B$ is defined as $A\ \spadesuit\ B = A + B + 4$, what is the value of $A$ for which $A\ \spadesuit\ 2 = 19$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $A\ \spadesuit\ B$ is defined as $A\ \spadesuit\ B = A + B + 4$, what is the value of $A$ for which $A\ \spadesuit\ 2 = 19$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
13
If $A\ \spadesuit\ B$ is defined as $A\ \spadesuit\ B = A + B + 4$, what is the value of $A$ for which $A\ \spadesuit\ 2 = 19$?
train