{"result":{"text":"therefore D equals open vertical bar table row 1 2 cell negative 3 end cell row 0 0 cell k plus 3 end cell row cell 2 k plus 1 end cell 0 1 end table close vertical bar equals 0\nrightwards double arrow k equals negative 3\na n d space D subscript 1 equals open vertical bar table row 1 2 cell negative 3 end cell row 3 0 0 row 0 0 1 end table close vertical bar not equal to 0"},"status":"ok"}