Докажите тождество: -а²-(3-2а²)+(7а²-+8а²)+16=0.

- a ^2 - ( 3 - 2а^2 ) + ( 7а^2 - 8 ) - ( 5 + 8а^2 ) + 16 = 0 ;
- а^2 - 3 + 2а^2 + 7а^2 - 8 - 5 - 8а^2 + 16 = 0 ;
A^2 * ( - 1 + 2 + 7 - 8 ) + ( - 3 - 8 - 5 + 16 ) = 0 ;
0 = 0