1 Jumlahkan (6x - 5y - 2z) - (8x + 6y + 9z) 2 Kurangkan (5x - 3y + 7) - (5y - 3x - 4)

1 . ( 14x + 11y + 11z )
2 . ( 2x - 2y - 3 ),

1.) (6x-5y-2z)+(8x+6y+9z)
=(6x+8x)+(-5y+6y)+(-2z+9z)
=14x+y+7z

2.) (5x-3y+7)-(5y-3x-4)
=5x-(-3x)-3y-5y+7-(-4)
=5x+3x-3y-5y+7+4
=8x-8y+11