def main():
print(draftsman(4, (-8, 12), (3, 3), (1, -2)))
def draftsman(k, last, *offsets):
x_sum = 0
y_sum = 0
for offset in offsets:
x_sum += offset[0]
y_sum += offset[1]
x = (k * x_sum + last[0]) / k
y = (k * y_sum + last[1]) / k
return (-x, -y)
if name == '__main__':
main()