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d=6
c=3
b=7
a=2
entonces a + b + c + d =18
b c d 4 +
------------
10 0 0 0
d+4 =10 d= 6 llevo 1
c+d = 10 c= 3 llevo 1
b+c = 10 b= 6 llevo 1
a+b = 10 a=3
el número es 3636
3+6+3+6 = 18