Ответ:
13+7х+12-9х=9
7х-9х+13+12=9
-2х+25=9
-2х=9-25
-2х=-16
х=-16:(-2)
х=8
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Ответ:
13+7х+12-9х=9
7х-9х+13+12=9
-2х+25=9
-2х=9-25
-2х=-16
х=-16:(-2)
х=8