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It is possible to alter the value of a MutableState variable in an if statement, as long as the if statement is inside a composable function (such as a @Composable function in Jetpack Compose) and the variable is marked with the @Composable annotation. This allows the system to track changes to the variable and rerender the associated UI components when necessary. However, it is generally advisable to avoid complex logic in a composable function and instead perform any necessary computation outside of the function and pass the result as a parameter.