Solve the equation \(\left(15+\_\right)+29=15+(8+29)\) to find the missing value.
Simplify the right-hand side of the equation.
Calculate \(8 + 29\): \(8 + 29 = 37\). Now, the equation becomes \(\left(15+\_\right)+29=15+37\).
Simplify further.
Calculate \(15 + 37\): \(15 + 37 = 52\). Now, the equation becomes \(\left(15+\_\right)+29=52\).
Isolate the missing value.
Subtract \(29\) from both sides of the equation: \(\left(15+\_\right) = 52 - 29\). This simplifies to \(\left(15+\_\right) = 23\).
Solve for the missing value.
Subtract \(15\) from both sides: \(\_ = 23 - 15\). This gives \(\_ = 8\).
The missing value is \(\boxed{8}\).
The missing value is \(\boxed{8}\).