Hi Guys, I need a help to show me step by step how to calculate below equation

Very short description: I am practicing how to calculate concentration in chemistry task, but math came thrue and I am stock with calculation, and I would like to kindly ask you to show me step by step how the person who resolved this task got the number (1.606 *10-6) , (2.203*10-8), (0.091773),

exercise is public: http://www.chem.science.unideb.hu/Solut ... obasic.pdf

Ex no 4

1.584 × 10-6 = 1.75 × 10-5 × (cweak base – 1.2589 × 10-3)

1.584 × 10-6 = 1.75 × 10-5 cweak base – 2.203 × 10-8

1.606 × 10-6 = 1.75 × 10-5 cweak base

cweak base = 0.091773 M

Thank you in advannce!