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3x/4 - 5 = 7
3x/4 = 7+5
3x = 4(7+5)
3x = 28 + 20
x =48/3
x = 16
El numero buscados es 16
Comprobacion:
3x/4 - 5 = 7
3(16)/4 - 5 = 7
12 -5 = 7
7 = 7