Ответ:
2.1х - 3.5 =1.4х
1.4х-2.1х=3.5
0.7х=3.5
х=3.5/0.7
х=5
ответ 5
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Ответ:
2.1х - 3.5 =1.4х
1.4х-2.1х=3.5
0.7х=3.5
х=3.5/0.7
х=5
ответ 5