Palindrome math

Normal sudoku rules apply. Place the digits 1-9 once each in every row, column and 3x3 box. From either end of the grey palindrome, it will read the same (i e. row 3 column 6 and row 4 column 7 are the same digit). Cells separated by a white dot are consecutive. Digits in a dotted cage without repeat sum to the total in the top left corner of the cage (if given). Cells separated by a black dot has one digit double the other (1:2 ratio). No negative constraints.