Ответ:
3х+9+4х-12=109
7х+9-12=109
7х-3=109
7х=109+3
7х=112
Х=112:7
Х=16
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Ответ:
3х+9+4х-12=109
7х+9-12=109
7х-3=109
7х=109+3
7х=112
Х=112:7
Х=16