5x-6y+8z+(7x-9z)-(-2y+9z-10)​

Penjelasan dengan langkah-langkah:

5x-6y+8z+(7x-9z)-(-2y+9z-10)​

= 5x-6y+8z+7x-9z+2y-9z+10

= 12x-4y-10z+10