Ответ:
5a - 12a = -7a
-4 + 6 = 2
-4 + 5а + 6 - 12а = 2 - 7а.
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Ответ:
5a - 12a = -7a
-4 + 6 = 2
-4 + 5а + 6 - 12а = 2 - 7а.