-ab+5ab= +4ab, -ab+5ab, +xy-xy= 0, +xy-xy, -3b+12b= +9b, -3b+12b, -3xy+4xy-xy= 0, -3xy+4xy-xy, 3abc-(-4abc)+abc= +8abc, 3abc-(-4abc)+abc, 15ab, 4ab-(-23ab)+(-12ab), 12xz, +7xz-12xz+14xz+3xz, (-2y)-(-3y)+(4y)= +5y, (-2y)-(-3y)+(4y), +4a, -2a+5a+12a-15a, -5bc, -bc+14bc-17bc-bc, -7x -x= -8x, -7x -x, (-2y)-(+6y)= -8y, (-2y)-(+6y)

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