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1. 7a - 8b, -9a -11b, 23b -7a, -15b +12a 2. 5a - 3b +6c, 6b - 3c -15a , 11b - 7a - 19c , 10c + 5a - 9b.please answer me I will mark you brainlist .​

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HiiiiiiiiiiiStep-by-step EXPLANATION:GOOD NIGHT BYE GYS



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