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3*(2x) = 40 + x
6x = 40+x
6x-x = 40
5x = 40
x = 40/5
x = 8
El numero es 8
comprobémoslo:
3*(2*8) = 40+8
3*(16) = 48
48 = 48 comprobado.
Saludos...
3x + 2x = 40 + x
ahora solo queda resolver
3x + 2x - x = 40
4x = 40
x = 40/4
x = 10
R: el número es 10