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a3=16
a7=a5+12
a+6d=a+4d+12
2d=12
d=6.
from the first line
a+2d=16
a+2(6)=16
a=16-12
a=4
now u have the series.
a,a+d,a+2d,,
a7=a5+12
a+6d=a+4d+12
2d=12
d=6.
from the first line
a+2d=16
a+2(6)=16
a=16-12
a=4
now u have the series.
a,a+d,a+2d,,
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