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El número = x
3(x - 7) = 39
3x - 21 = 39
3x = 39 + 21
3x = 60
x = 60/3
x = 20
Respuesta.
El número es el 20
x=numero a buscar
3(x-7)=39
3x-21=39
3x=39+21
3x=60
x=60/3
x=20
el numero es el 20
prueba
3(x-7)=39
3(20-7)=39
3(13)=39
39=39
espero te sirva
saludos