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= 12x +12y +3x -3y +4y -8x
= 12x +3x -8x +12y -3y +4y
= 7x +13y
2. 9(m -n) +6(m +n) -3(m -2n)
= 9m -9n +6m +6n -3m +6n
= 9m +6m -3m -9n +6n +6n
= 12m +3n
Itu jawabannya.
12x + 12y +3x -3y+4y-8x
7x + 13 y
9(m-n)+6(m+n)-3(m-2n)
9m-9n+6m+6n-3m+6n
12m + 4n