if the 7th term of ah.p.is 8 and the 8th term is 7. then find the 28th term
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a+6d=8
a+7d=7
- - -
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-1d =1
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d=-1 , a=0
a+27d= -27
a+7d=7
- - -
----------
-1d =1
----------
d=-1 , a=0
a+27d= -27
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