4x + 3y -2z + 9y - 8x +2z
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= 4x+3y-2z+9y-8x+2z
= -4x +12y
= -4x +12y
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4x +3y-2z + 9y-8x+2z
-2z &+2z get cancle
4x+8x + 9y-3y
12x + 6y
-2z &+2z get cancle
4x+8x + 9y-3y
12x + 6y
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