-2.3а-2.2b+1.9b-2.7a-2.1b+3.1a =
= -2.3a-2.7a+3.1a -2.2b+1.9b-2.1b =
= -5a+3.1a -4.3b +1.9b =
= -1.9a - 2.4b
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-2.3а-2.2b+1.9b-2.7a-2.1b+3.1a =
= -2.3a-2.7a+3.1a -2.2b+1.9b-2.1b =
= -5a+3.1a -4.3b +1.9b =
= -1.9a - 2.4b