chofi kima motlaka ki cheghol ki tb3i 3adad salab ywali mojeb hakak kima motlka ki tkon dakhel salba ki tnahi hadok akwas twali mojba haka \-6\ = \6\ haka kima motlaka bach tfahmi ktar afthi ktab p32 et tu vas me compris inchallah rabi m3a soeur ]