Move 1 Match to Solve the Equation

Explaining on Instagram: "In the aftermath of the first plane striking the North Tower on September 11, 2001, twenty-four-year-old Bradley “Brad” Fetchet, working on the 89th floor of the South Tower, called his parents. After a brief call with his father, he left a voicemail for his mother saying he was “obviously alive” but shaken, that a plane had crashed into World Trade Center One, and that they were in Tower Two. He asked them to call back and said he expected the firm might be closed for