12q-4q-12q=, -4q, 4q, -28q, 28q, -4r+2s-7s=, -4r+5s, -4r-5s, 13rs, -9rs, -3r-5r+15r=, 13r, -7r, -13r, 7r, 2(4a+5b)=, 18ab, 8a+5b, 8a+10b, 4a+10b, -x+7y+9x-9y=, 6xy, 8x+2y, -7xy, -2y+8x, 4(3xy-3)=, 12xy-3, 12xy-12, 36xy, 12xy, -b(8ab-7a)=, -8ab-7ba, -8ab2-7ab, -8ab2+7ab, 8ab2+7ab, 2-4(x-7y)=, 2(x-7y), -2x+7y, -4x-7y+2, 7y-4x+2, -y(4x-y)+x(-4x-y)=, -4xy+y-4x-xy, 8xy+2y-4x, -5xy+y2-4x2, 5xy-y2-4x2, -2(x+6y)-y(3-x)=, 2x+6y+xy, 12y-3x-3y+xy, -12xy+3xy, xy-2x-15y

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