Answer: [tex]x=-22.42[/tex]
Simplify both sides of the equation
[tex]-18.43=x+3.99[/tex]
Flip the equation
[tex]x+3.99=-18.43[/tex]
Subtract 3.99 from both sides
[tex]x+3.99-3.99=-18.43-3.99\\x=-22.42[/tex]