2Х+45×9=67
2Х+405=67
2Х=67-405
2Х=-338
Х=-338:2
х=-169
Проверка
2х(-169)+45х9=67
-338+405=67
67=67
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2Х+45×9=67
2Х+405=67
2Х=67-405
2Х=-338
Х=-338:2
х=-169
Проверка
2х(-169)+45х9=67
-338+405=67
67=67