х+9 7/8 =7 3/4+ 4 1/2
х+9 7/8= 12 1/4
х=12 1/4-9 7/8
х=-4 5/8
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х+9 7/8 =7 3/4+ 4 1/2
х+9 7/8= 12 1/4
х=12 1/4-9 7/8
х=-4 5/8