Автор - cofiy15

189+(х-177)=218 156-(х+12)=24

Ответ

Автор - violetta287

Ответ:

1) 189+(х-177)=218

189+х-177=218

12+х=218

х=206

2)156-(х+12)=24

156-х-12=24

144-х=24

-х=24-144

-х=-120

х=120

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