To solve for x, we isolate the variable by dividing both sides by 48:

48x = 624
x = 624/48
x = 13

To solve for a, we isolate the variable by dividing both sides by 22:

624a = 1342
a = 1342/624
a ≈ 2.15

To solve for u, we isolate the variable by multiplying both sides by 37:

1342u = 37*15
1342u = 555
u = 555/1342
u ≈ 0.41

To solve for b, we have that b = 81.