\(a\left( {x - {x_0}} \right) + b\left( {y - {y_0}} \right) + c\left( {z - {z_0}} \right) = 0\)      

\({x_0}\left( {x - a} \right) + {y_0}\left( {y - b} \right) + {z_0}\left( {z - c} \right) = 0\)

\(x\left( {a - {x_0}} \right) + y\left( {b - {y_0}} \right) + z\left( {c - {z_0}} \right) = 0\)       

\(a\left( {x + {x_0}} \right) + b\left( {y + {y_0}} \right) + c\left( {z + {z_0}} \right) = 0\)