[tex] \huge \boxed{\mathbb{QUESTION} \downarrow}[/tex]
[tex] \large \boxed{\mathfrak{Answer \: with \: Explanation} \downarrow}[/tex]
[tex] \sf \: - 377 = x - 1000[/tex]
Swap sides so that all variable terms are on the left-hand side.
[tex] \sf \: x-1000=-377 [/tex]
Add 1000 to both sides.
[tex] \sf \: x=-377+1000 [/tex]
Add -377 and 1000 to get 623.
[tex] \boxed {\boxed{ \tt\: x=623 }}[/tex]
