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x = 3 (x+3) /12
x = (x+3) /4
4x = x+3
4x-x=3
3x=3
x=3/3
x=1
El termino desconocido es 1
Si te sirvió dale mejor respuesta
4x = 3 (4x) + 3
4x = 12x + 3
4x - 12x = 3
- 8x = 3
x = 3/-8
x = - 3/8
El valor de x es - 3/8