a(n) - ар пр
a(6) = 3
a(9) = 0
d-?
a(n) = a(1) +(n-1)d
a(9) = a(6) + 3d
0 = 3 + 3d
-3 = 3d
d = -1
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Verified answer
a(n) - ар пр
a(6) = 3
a(9) = 0
d-?
a(n) = a(1) +(n-1)d
a(9) = a(6) + 3d
0 = 3 + 3d
-3 = 3d
d = -1