Find the value of x if 12th term of the AP is 81 and AP is x-7,x-2,x+3.........find S12 also

Find the value of x if 12th term of the AP is 81 and AP is x-7,x-2,x+3

1.	Find the value of x if 12th term of the AP is 81 and AP is x-7,x-2,x+3.........find S12 also
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