Помогите по алгебре пж!!

Question

Помогите по алгебре пж!!

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Answer 1

2 + 20b/(25-b²) - 10/(5-b) =

= (50-2b²+20b-50-10b)/(5-b)(5+b) =

= (10b-2b²)/(5-b)(5+b) =

= 2b(5-b)/(5-b)(5+b) =

= 2b/(5+b)