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Quick and Easy Puzzle

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Find the values of  a and b:

12 x a + b = 98

123 x a + b+1 = 987

1234 x a + b+2 = 9876

12345 x a + b+3 = 98765

123456 x a + b+4 = 987654

1234567 x a + b+5 = 9876543

12345678 x a + b+6 = 98765432

123456789 x a + b+7 = 987654321

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