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Cuya mitad mas el doble mas la tercera parte mas el triple dan 70:
x/2 + 2x + x/3 + 3x = 70
2(x/2 + 2x + x/3 + 3x) = 2(70)
x + 4x + 2x/3 + 6x = 140
3(x + 4x + 2x/3 + 6x) = 3(140)
3x + 12x + 2x + 18x = 420
35x = 420
x = 420/35
x = 12
La suma de sus cifras es 1 + 2 = 3
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