This is the 1619th most frequent Turkish word.
sorununu
"Your problem" or "your issue".
In this sentence, 'sorununu' is used in the possessive form, combined with the accusative case suffix, discussing '[her] problem'.
Matematik sorununu çözmek için öğretmeninden yardım istedi.
She asked her teacher for help to solve the math problem.
Here, 'sorununu' conveys possessiveness (your) and specificity as it is the object of the verb 'anlamak' (to understand).
Senin bu sorunununu anlamak benim için önemli.
Understanding this problem of yours is important to me.
In this example, 'sorununu' indicates the person's (your) issue being explained to others.