Jawabanmu

2014-08-26T16:11:24+07:00
(5x-6y+8z)+(7x-9z)-(2y+9z-10)
=5x+7x-6y-2y+8z-9z-9z-10
=12x-8y-10z-10 ini hasilnya
2 3 2
2014-08-26T17:36:37+07:00
(5x-6y+8z) + (7x-9z) - (2y+9z-10)
= (5x-6y+8z) + (7x-9z) + (-2y-9z+10)
= (5x + 7x) + (-6y-2y) + (8z-9z-9z) + 10
= 12x + (-8y) + (-10z) + 10
= 12x - 8y - 10z + 10
itulah hasilnya
2 4 2