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a3=a1+2r
8=4+2r
2r=8-4
2r=4
r=4/2
r=2
........................
a7=a1+6r=4+6*2=16
b]
a9=a1+8r
-21=3+8r
8r=-24
r=-24/8
r=-3
.....................
a22=a1+21r=3+21*(-3)=3-63=-60