{"result":{"text":"begin mathsize 14px style equals open negative e to the power of x minus t end exponent close vertical bar subscript 0 superscript x plus open e to the power of t minus x end exponent close vertical bar subscript x superscript 4 equals negative 1 plus e to the power of x plus e to the power of 4 minus x end exponent minus 1 equals e to the power of x plus e to the power of 4 minus x end exponent minus 2 end style"},"status":"ok"}