(х : 50-30)*60 =540
60* х:50-1800=540
60* х:50=2340
60* х=2340*50
60 *х=117000
х=117000:60
х=1950
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(х : 50-30)*60 =540
60* х:50-1800=540
60* х:50=2340
60* х=2340*50
60 *х=117000
х=117000:60
х=1950
х÷50-30=9
х÷50=9+30
х÷50=39
х=39×50
з=1950