Ответ: -2.8х(3х+7)=1.4+4.2
-8.4х+19.6х=5.6
х=5.6:11.2
х=56:112
х=0.5
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Ответ: -2.8х(3х+7)=1.4+4.2
-8.4х+19.6х=5.6
х=5.6:11.2
х=56:112
х=0.5