12*х*9=1296
х=1296:12:9
х=12
проверка
12*12=144
144*9=1296
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12*х*9=1296
х=1296:12:9
х=12
проверка
12*12=144
144*9=1296
X=1296/12/9=12
X=12
12*9=108
108*12=1296