Respuesta:
78 + x + 7 = 87
Explicación paso a paso:
x + 7 = 87 - 78
x = 9 - 7
X =2
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Respuesta:
78 + x + 7 = 87
Explicación paso a paso:
78 + x + 7 = 87
x + 7 = 87 - 78
x = 9 - 7
X =2