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213+163=376
Por descomposición canónica·:
2·10²+1·10+a+1·10²+6·10+a=a·10²+7·10+6
2·100+10+a+1·100+60+a=a·100+70+6
200+10+a+100+60+a=100a+76
370+2a=100a+16
370-76=100a-2a
294=98a
294/98=a
3=a