(12+34х)*56-789=18923(12+34х)*56=18923+789(12+34х)*56=19712(12+34х)=19712:5612+34х=35234х=352-1234х=340х=340:34х=10(12+34*10)*56-789=18923 18923=18923
(12+34х)*56-789=18923
(12+34х)*56=18923+789
(12+34х)*56=19712
(12+34х)=19712:56
12+34х=352
34х=352-12
34х=340
х=340:34
х=10
(12+34*10)*56-789=18923
18923=18923