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reemplazando:
8 = A1 + (4-1)d .......8= A1+3d despejando A1= 8 - 3d -----
14=A1 +(8-1)d.......14=A1+ 7d despejando A1=14-7d -----
igualando:
8 - 3d = 14 - 7d ---
4d = 6 ---
d = 3/2 -----
reemplazando : A1= 8 - 3(3/2) = 8 - 9/2 = 7/2 termino general