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From the sum of 3a²-a-3 and 2a-9,subtract a²-3a-7

From the sum of 3a²-a-3 and 2a-9,subtract a²-3a-7
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From the sum of 3a²-a-3 and 2a-9,subtract a²-3a-7

User Haris Krajina
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the sum of 3a²-a-3 and 2a-9 is 3a²+a-12

3a²+a-12 - (a²-3a-7) = 3a²+a-12 - a² + 3a + 7 =

2a² +4a - 5
User Luan Kevin Ferreira
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