х:5=540:9
х:5=60
х=60*5
х=300
954-78-а=277
876-а=277
а=876-277
а=599
305+х+55=1000
360+х=1000
х=1000-360
х=640
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х:5=540:9
х:5=60
х=60*5
х=300
954-78-а=277
876-а=277
а=876-277
а=599
305+х+55=1000
360+х=1000
х=1000-360
х=640