Salut!
Răspuns: -801 ✅
[tex] \bf\blue{✏1000 -74 \times 23 - a = 99}[/tex]
[tex] \bf\blue{ 1000 - 1702 - a = 99}[/tex]
[tex] \bf\blue{ - 702 - a = 99}[/tex]
[tex] \bf\blue{ - a = 99 + 702}[/tex]
[tex] \bf\blue{ - a = 801 | \times ( - 1)}[/tex]
[tex] \blue{\boxed{ \boxed{\bf{a = - 801}}}} [/tex]
