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= 6x-3x+5-6
= 3x + -1
2. 6x-5y-2z-8x+6y+9z
= 6x - 8x - 5y + 6y - 2z + 9z
= -2x + y +7z
3. 7x+15y-5x+9y
= 7x - 5x + 15y + 9y
= 2x + 24y
4. 5y-3x-4-5x+3y-7
= 5y+3y-3x-5x-4-7
= 8y-8x-11
5. -9xy- - - 6xy -
=
=
Jawabannya betul kok :)