a₇=a₃+4r
-8=4+4r
4r=-8-4
r=-12:4=-3
a₃=a₁+2r
4=a₁+2×-3
a₁=4+6=10
a₁=10
a₂=10-3=7
a₃=7-3=4
a₄=4-3=1
a₅=1-3=-2
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a₇=a₃+4r
-8=4+4r
4r=-8-4
r=-12:4=-3
a₃=a₁+2r
4=a₁+2×-3
a₁=4+6=10
a₁=10
a₂=10-3=7
a₃=7-3=4
a₄=4-3=1
a₅=1-3=-2