a8=a1+7d
a14=a1+13d=a8+6d=-18
6d-9=-18
6d=-18+9
6d=-9
d=-9/6
d=-3/2
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a8=a1+7d
a14=a1+13d=a8+6d=-18
6d-9=-18
6d=-18+9
6d=-9
d=-9/6
d=-3/2