A line $l$ is the graph of $y = ax + b$. Line $l_1$ is $l$ shifted 3 units to the left and two units downward and passes through the points $(5,8)$ and $(7,14)$. What is $a - b$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A line $l$ is the graph of $y = ax + b$. Line $l_1$ is $l$ shifted 3 units to the left and two units downward and passes through the points $(5,8)$ and $(7,14)$. What is $a - b$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
17
A line $l$ is the graph of $y = ax + b$. Line $l_1$ is $l$ shifted 3 units to the left and two units downward and passes through the points $(5,8)$ and $(7,14)$. What is $a - b$?
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