х+у=138
х*2/9=8/10*у ⇒ х=36/10*у=3,6у
3,6у+у=138
4,6у=138
у=30
х=138-у=138-30=108
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х+у=138
х*2/9=8/10*у ⇒ х=36/10*у=3,6у
3,6у+у=138
4,6у=138
у=30
х=138-у=138-30=108