3a(2a-b)-{a(6a-3b)-b(3a-5b)}
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3a(2a-b)-{a(6a-3b)-b(3a-5b)}
6a² -3ab - { 6a² - 3ab -3ab +5b²}
6a² -3ab -6a² +3ab +3ab -5b²
6a² -6a² -3ab -3ab +3ab -5b²
6a² -6a² -6ab +3ab -5b² elimina 6a² -6a²
-3ab -5b²
6a² -3ab - { 6a² - 3ab -3ab +5b²}
6a² -3ab -6a² +3ab +3ab -5b²
6a² -6a² -3ab -3ab +3ab -5b²
6a² -6a² -6ab +3ab -5b² elimina 6a² -6a²
-3ab -5b²
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