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(a²+x-1) (4m+3n)
(a+3)(a+1) -4(a+1) =
(4a—12)(a+1)
(x+y) (n+1) -3(n+1)=
(n+1)(—3x—3y)
a(n+2) +n+2=
(n+2)(a+1)