50-9*а=23
9*а=50-23
9*а=27
а=27:9
а=3
проверка
50-9*3=23
23 = 23
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50-9*а=23
9*а=50-23
9*а=27
а=27:9
а=3
проверка
50-9*3=23
23 = 23