Ответ:
х+9/20=3/4
х=3/4-9/20
х=15/20-9/20
х=6/20=3/10
25/36-х=5/18
25/36-х=10/36
х=(25-10)/36
х=15/36=5/12
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Ответ:
х+9/20=3/4
х=3/4-9/20
х=15/20-9/20
х=6/20=3/10
25/36-х=5/18
25/36-х=10/36
х=(25-10)/36
х=15/36=5/12