The bottom of the square box is filled regularly with glass marbles. If the number of marbles placed in contact with the wall is 84, how many marbles are in contact with one wall?
84 4 [OP_SUB] 4 [OP_DIV] 2 [OP_ADD]
var_a = 84
var_b = 4
var_c = var_a - var_b
var_d = 4
var_e = var_c / var_d
var_f = 2
var_g = var_e + var_f
print(int(var_g))