a+6d=7-a+6d=14
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Step-by-step explanation:
a = 7 - 6d eq(i)
a = 6d - 14 eq(ii)
7 - 6d = 6d - 14
21 = 12d
d = 4/7
put the value of d in any equation
let put it in eq(i)
a = 7 - 6 × 4/7
a = 7 - 24/7
a = (49-24)/7
a = 25/7
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