(2x-4y+6z)+(8x-11y+3z)+(2x-6y-2z)

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(2x-4y+6z)+(8x-11y+3z)+(2x-6y-2z)

Jawaban Terkonfirmasi

⇒ (2x-4y+6z)+(8x-11y+3z)+(2x-6y-2z)
    = 2x+8x+2x-4y-11y-6y+6z+3z-2z
    = 12x-21y+7z