find the sum of the following algebraic expressions : 7a² - 5a + 2, 3a² - 7, 2a + 9, 1 + 2a - 5a²
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Step-by-step explanation:
7a² - 5a + 2+ 3a² - 7+2a + 9+1 + 2a - 5a²
= 10a²- 5a²+4a-5a+12-7
= 5a²- a+5
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