Ответ:
60+(х-20)=100
х-20=100-60
х-20=40
х=20+40
х=60
60-20=100-60
40=40
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Ответ:
60+(х-20)=100
х-20=100-60
х-20=40
х=20+40
х=60
60-20=100-60
40=40