(31×550-x)×120=10200
х=16965
2046000-120х=10200
-120х=10200-2046000
-120х=2035800
х=2035800:120=16965
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(31×550-x)×120=10200
х=16965
2046000-120х=10200
-120х=10200-2046000
-120х=2035800
х=2035800:120=16965