like this

bethigh = false
good    = 100000
prebet  = 0
nextbet = prebet
box     = 0
bit     = 0
min     = 49.95
max     = 50.05
cox     = 49
kix     = 0
chance  = cox
function dobet()
if win then
    chance  = cox
    nextbet = prebet
    bethigh = false
end
if (chance==min) and !win then
   nextbet = previousbet*(math.random(200,400)/100)
end
if  lastBet.Roll < min then
    box+=1
    bit = 0
end
if lastBet.Roll > max then
    bit+=1
    box = 0
end
if lastBet.Roll > min and lastBet.Roll < max then
    bit = 0
    box = 0
end
if (chance == cox) and bit >= 7 then
    nextbet = balance/512
    box     = 0
    bit     = 0
    chance  = min
end
if (chance == cox) and box >= 7 then
   chance  = min
   nextbet = balance/512
   box     = 0
   bit     = 0
end
if balance > good then
    stop()
end
end