solve maths specialist
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a+d=8____(1)
a+7d=3(a+d)+2
a+7d=3a+3d+2
a-4d=-2_______(2)
(1)-(2)===> 5d=10
d=2
put d=2 in (1)
a+2=8
a=6
sum of eight terms
S8=8/2[2*6+(8-1)2]
= 4(12+14)
=4*26
=104
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