234+х-456=178
х=456+178-234
х=400
(234 + x) - 456 = 178
234 + x = 178+456
234+х=634
х=634-234
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234+х-456=178
х=456+178-234
х=400
(234 + x) - 456 = 178
234 + x = 178+456
234+х=634
х=634-234
х=400