1. 10x 3x a -12y 2. -6x제곱 -x제곱 2a제곱 3. -4/3a -3/2x 26/15y 4.-A+B+C -2A+2B-6C -a+b+c -6a+2b -2x+1/3y+2/3 5. 8x-5 2x+4y -2x 6. -1/6a+5 7a-2b/12
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