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What is (12.2a + 9.7b) – (18.1b – 0.2a) – (6.7a + 6.8b), simplified?

What is (12.2a + 9.7b) – (18.1b – 0.2a) – (6.7a + 6.8b), simplified?
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What is (12.2a + 9.7b) – (18.1b – 0.2a) – (6.7a + 6.8b), simplified?

User Dolinda
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The answer should be 5.7a - 15.2b
User Marquinho Peli
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User ZeZNiQ
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What is (12.2a + 9.7b) – (18.1b – 0.2a) – (6.7a + 6.8b), simplified?
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