interior angles in polygons

We have a decagon ....the sum of the interior angles in a decagon is  (10 - 2)*180  =

1440°

[ Hint : The 80°  exterior angle means a 360 - 80  = 280°  interior angle  ]

So we have that

[ 107 + 126 + 325 + 125 + 95 +  x + 90 +  280 + 47 + 130 ]  = 1440

Rearrange as

1440 - [ 107 + 126 + 325 + 125 + 95 +  90 +  280 + 47 + 130 ]  = x

1440 - [ 1325 ]  =  x

115°  =  x