[tex]\displaystyle 5x-60=12-x\\5x+x=12+60\\6x=72\\x=12[/tex]
5х-60=12-х
5х+х=12+60
6х=72
х=72 : 6
х=12
Ответ: х=12
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[tex]\displaystyle 5x-60=12-x\\5x+x=12+60\\6x=72\\x=12[/tex]
5х-60=12-х
5х+х=12+60
6х=72
х=72 : 6
х=12
Ответ: х=12