х+х+х-3=30
3х=33
х=11
х(1)=11
х(2)=11
х(3)=11-3=8
11+11+8=30
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х+х+х-3=30
3х=33
х=11
х(1)=11
х(2)=11
х(3)=11-3=8
11+11+8=30