4,6а - 6,9b - 11,9b + 3,4a = 8a - 18,8a
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-6,3 + 3,6x + 5,27 - 3,1x = 8,87 - 9,4x
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6,6 - 40,04m - 10,36 + 7,84n = 7,84n - 40,04m - 3,76
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3,7 - 15,87c + 3,22 - 8,51b = 6,92 - 15,87c - 8,51b
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3xy - 5xz - 7xy - 3yz = - 4xy - 5xz - 3yz