All seven boxes of apples contain the same weight of apples. After taking out 20 kilograms (kg) of apples from each box, the weight of the seven apple boxes was equal to the weight of the first three apple boxes. Find the weight of the first box of apples.
20 7 [OP_MUL] 7 3 [OP_SUB] [OP_DIV]
var_a = 20
var_b = 7
var_c = var_a * var_b
var_d = 7
var_e = 3
var_f = var_d - var_e
var_g = var_c / var_f
print(int(var_g))