Ответ:
-5х+15+4х-8-12х+6
-5х-4х+12х=-15+8-6
4х=-12
х=-12:4
х=-3
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Ответ:
-5х+15+4х-8-12х+6
-5х-4х+12х=-15+8-6
4х=-12
х=-12:4
х=-3