A‾+B‾+C‾=0\overline{\mathbf{A}}+\overline{\mathbf{B}}+\overline{\mathbf{C}}=0A+B+C=0
A‾−B‾−C‾=0\overline{\mathbf{A}}-\overline{\mathbf{B}}-\overline{\mathbf{C}}=0A−B−C=0
A‾=B+C\overline{\mathbf{A}}=\mathrm{B}+\mathrm{C}A=B+C
A‾+B‾=C‾\overline{\mathrm{A}}+\overline{\mathrm{B}}=\overline{\mathrm{C}}A+B=C
