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4 (x + 4) - 5 (x - 3) = 2x + 4
Aplicamos propiedad distributiva
4x + 16 - 5x + 15 = 2x + 4
4x - 5x + 16 + 15 = 2x + 4
- x + 31 = 2x + 4
- x - 3x = 4 - 31
- 3x = - 27
x = - 27/-3
x = 9
Respuesta.
x = 9