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

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