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= 6x+5-3x-6
= 3x-1
2. 6x-5y-2z + (-8x + 6y + 9z)
6x - 5y - 2z -8x +6y +9z
= -2x + y + 7z
3. 3(2x^2-4x+5) + 2(4x^2 + 3x - 7)
= 6x^2 - 12x + 15 + 8x^2 + 6x - 14
= 14x^2 - 6x + 1
mudah-mudahan. membantu