= 18х + 30у + 7х - 5у = 25х + 25у = 25(х + у)
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= 84а + 3b - 73a + 8b = 11a + 11b = 11(a + b)
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= 3m + 35n + 24m - 8n = 27m + 27n = 27(m + n)
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= 51c + 85d + 6c - 28d = 57c + 57d = 57(c + d)