
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
$a$, $b$, $c$, $d$ are rational numbers. A defined operation is: $|\begin{array}{l}{a}&{b}\\{c}&{d}\end{array}|=ad-bc$. If $|\begin{array}{l}{2}&{4}\\{(1-x)}&{5}\end{array}|=18$, then the value of $x$ is ____.

Present the answer in LaTex format: \boxed{Your answer}
user