\( a - 1 ) ( \frac { a } { s } = 2 ) + ( a - 3 ) - ( ) ^ { 2 } 5 \)

It seems like there might be some confusion or a typo in the expression you've provided. Let's break it down and clarify what you might be trying to express. The expression you wrote is: \[ ( a - 1 ) \left( \frac { a } { s } = 2 \right) + ( a - 3 ) - ( ) ^ { 2 } 5 \] 1. The term \( ( a - 1 ) \left( \frac { a } { s } = 2 \right) \) seems to imply that you want to multiply \( (a - 1) \) by something, but the equation \( \frac { a } { s } = 2 \) is not clear in this context. 2. The term \( ( ) ^ { 2 } 5 \) is also unclear because there is an empty parenthesis. Could you please clarify or correct the expression? For example, if you meant to set up an equation or if there are specific operations you want to perform, please provide that information.