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We let the number be abcd.
From the given:
b = 2c
a+b+c+d = 12
Since we have only two different numbers used we let:
a = b, c = d, this would mean:
2b + 2c = 12
2(2c) + 2c = 12
6c = 12
c = 2
b = 4

So the number is 4422