-5a^2-a^2+3a-7-3a^2-2a^2+5a-5
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-5a² - a² + 3a - 7 - 3a² - 2a² + 5a - 5
= - 5a² - a² - 3a² - 2a² + 3a + 5a - 7 - 5
= - 11a² + 8a -12
hope it helps you!!
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