Ответ:
21+6x-4×(-6,5)=-19
21+6x+26=-19
47+6x=-19
6x=-19-47
6x=-66
x=-11
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Ответ:
21+6x-4×(-6,5)=-19
21+6x+26=-19
47+6x=-19
6x=-19-47
6x=-66
x=-11