1 x 9 + 2 =
12 x 9 + 3 =
123 x 9 + 4 =
1234 x 9 + 5 =
12345 x 9 + 6 =
123456 x 9 + 7 =
1234567 x 9 + 8 =
12345678 x 9 + 9 =
123456789 x 9 + 10 =
9 x 9 + 7 =
98 x 9 + 6 =
987 x 9 + 5 =
9876 x 9 + 4 =
98765 x 9 + 3 =
987654 x 9 + 2 =
9876543 x 9 + 1 =
98765432 x 9 + 0 =
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