Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
 Kalamu na penseli zina gharama ya jumla ya $6. Ikiwa kalamu inagharimu mara mbili ya penseli, ni gharama gani ya kalamu?


### Response:
 Acha x iwe gharama ya penseli.
Ikiwa kalamu inagharimu mara mbili ya gharama ya penseli, basi kalamu inagharimu 2*x.
Kwa kuongeza gharama ya kalamu na penseli tunapata 2*x + x = $6.
Kwa kuunganisha vipengee sawa, tunapata 3*x = $6.
Kwa kugawanya pande zote mbili kwa 3, tunapata x = $6 / 3 = $2.
Kwa kuwa kalamu inagharimu mara mbili ya gharama ya penseli, kalamu inagharimu 2 * $2 = $<<2*2=4>>4.