Question

[(624+123:3-a):6]x3+254=554

9236-[(3245-1236+63x4:2):5+a]+23124=31860

Answer 1

[(624+41-a):6]*3+254=554
[(665-a):6]*3+254=554
[(665-a):6]*3=554-254
[(665-a):6]*3=300
[(665-a):6]=300:3
[(665-a):6]=100
(665-a)=100*6
(665-a)=600
a=665-600
a=65 

9236-[(3245-1236+63*4:2):5+a]+23124=31860
9236-[(1009+63*2):5+a]+23124=31860
9236-[(1009+126):5+a]=23124=31860
9236-[1135:5+a]+23124=31860
9236-[227+a]+23124=31860
9236-227-a+23124=31860
9099-a=31860-23124
9099-a=8736
a=9099-8736
a=363