-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)=-2y+3y+4y=5y - (-2y)-(-3y)+(4y), +4a - -2a+5a+12a-15a, -5bc - -bc+14bc-17bc-bc, (-2+1)/4ab=-1/4ab - -1/2ab+1/4ab, (+8-9)/12xy= -1/12xy - +2/3 xy-3/4xy, (-10+9)/12c= -1/12c - -5/6c+3/4c, (+8-3)/18xy= +5/18xy - 4/9xy-1/6xy, -7x -x=-8x - -7x -x, (-2y)-(+6y)=-2y-6y=-8y - (-2y)-(+6y),

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