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SEA EL NÚMERO DE CUATRO CIFRAS: abcd
POR DATO:
abcd + 3(10⁴ - abcd) = 22508
abcd + 3 . 10⁴ - 3abcd = 22508
30000 - 22508 = 2 abcd
7492 = 2 abcd
3746 = abcd
ESO ES TODO, SALUDOS