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e. 15 + 3a - 5a - a² = 15 - 2a - a²
f. a³ + 2a² - 2a² - 4a - a - 2 = a³ + 5a - 2
e. 15 + 3a - 5a -a² = -2a +15 - a²
semoga benar :D