Step-by-step explanation:
X+10+4X-12=83
5X-2=83
+2. +2.
5X=85
÷. ÷
5. 5
X=17
Now you plug it in:
(17)+10= 27=ABC°
ABD°=83
4(17)-12= 56 = DBC°
ABD would be the total of ABC and DBC since it's basically those 2 combined.
