find b in terms of a and c , such that a, b, and c are in an A.P.
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a+d=b..(1)
c-d=b..(2)
adding (1)$(2)
a+c=2b
(a+c)÷2=b
c-d=b..(2)
adding (1)$(2)
a+c=2b
(a+c)÷2=b
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