172х+(727х+818283)

To simplify the expression \(172x + (727x + 818283)\), you can follow these steps:

1. Remove the parentheses: \[ 172x + 727x + 818283 \]

2. Combine like terms (the terms that have \(x\)): \[ (172x + 727x) + 818283 = 899x + 818283 \]

So, the simplified expression is: \[ \boxed{899x + 818283} \]