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Entonces:
¿Cuál es el numero cuyo anterior es igual ala novena parte de 81?
==>>>> x - 1 = 81 ÷ 9
RESOLVIENDO:
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x - 1 = 81 ÷ 9
x - 1 = 9
x = 9 + 1
x = 10
COMPROBAMOS:
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x - 1 = 81 ÷ 9
10 - 1 = 81 ÷ 9
9 = 9 ==>>> CORRECTO
RESPUESTA:
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El numero es 10