**How can I calculate the optimal lotSize for 5 trades?**

For example: EUR/USD, leverage 500:1, TP/SL 50 pips, free margin 5000 dollar, open price 1.1900.

If I do $ 5000= (lots for 5 trades + 50 pips SL for 5 trades)/5

- 50 SL for 5 trades=50 pips * 10 pipvalue * ? lotsize

result: ?= 50 * 10 * ?

- lots for 5 trades= (5000 - 50 SL for 5 trades)/5

result: ? = 5000-?/5

Then I cannot calculate it. Can anyone help me?

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