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(-8x+10y-9z) - (4x-11y-9z)
= -8x - 4x + 10y + 11y - 9z + 9z
= -12x + 21 y
= -3(4x - 7y)
Semoga membantu
=4x-11y-9z+8x-10y+9z
=4x+8x-11y-10y-9z+9z
=12x-21y