Hi,





           5d = -50     |subtracting a2 from a7

            d = -10   and 

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Answer by richwmiller(17219)   (Show Source): You can put this solution on YOUR website!
 an = a + (n - 1)d



43 = a + 6d,

91 = a + d

-48=5d

a = 503/5,   d = -48/5

The other tutor used 93 instead of the given 91 

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