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(a²-1)(b-1)=(a-1)(b²-1)
a²b-a²-b+1=ab²-a-b²+1
a²b-a²-ab²+a+b²-b=0
a²(b-1)-a(b²-1)+b(b-1)=0
a²(b-1)-a(b-1)(b+1)+b(b-1)=0
(b-1)[a²-ab-a+b]=0
(b-1)(a(a-1)-b(a-1))=0
(b-1)(a-1)(a-b)=0
(y²⁰⁰⁹-1)(x²⁰⁰⁹-1)(x²⁰⁰⁹-y²⁰⁰⁹)=0
y=1 i x∈R ∨x=1 i y∈R ∨ x=y