Ответ-х=-18
3,4-2,6х+7,8=40-х
11.2-2.6х+7.8=40-х
-2,6х+х=40-11.2
-1.6х=28.8
х=-18
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Ответ-х=-18
3,4-2,6х+7,8=40-х
11.2-2.6х+7.8=40-х
-2,6х+х=40-11.2
-1.6х=28.8
х=-18