Ответ:
-12-2x=-x-3
-2x-x=-3+12
-3x=9
X=-3
-12-2х=х-3
-2х-х=-3+12
-3х=9
х=-3
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Ответ:
-12-2x=-x-3
-2x-x=-3+12
-3x=9
X=-3
-12-2х=х-3
-2х-х=-3+12
-3х=9
х=-3