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a₁+39r=120
a₂₀=40
a₁+19r=40
Restando:
a₁+39r=120
a₁+19r=40
---------------
20r=80
r=4
Reemplazando el valor de r en:
a₁+39r=120
a₁+39(4)=120
a₁+156=120
a₁=-36