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4=20+4r /-20
-16=4r /:4
r=-4
a6=a1+5r
20=a1+5*(-4)
20=a1-20 /+20
a1=40
an=a1+(n-1)*r
an=40 +(n-1)*(-4)
an=40-4n+4
an=-4n+44