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5x[x - [3x + 3 - 2x - 3x] - 2]
Cancelar (+3x) con (- 3x)
5x[x - [3 - 2x] - 2]
Multiplicar lo del corchete por (- 1)
5x[x - 3 + 2x - 2]
5x[3x - 5]
15x² - 25x
Espero haberte ayudado, saludos!