the common difference (d) = -4, and the seventh term (a7) is 4, then find the first term

the common difference (d) = -4, and the seventh term (a7) is 4, then f

1.	the common difference (d) = -4, and the seventh term (a7) is 4, then find the first term
Answer» 28 a+6×-4=4a-24=4a=24+4=28 a=28.......