Пошаговое объяснение:
14-7 21/29+х+4 23/29=12 2/29
14+4+х-6 50/29+4 23/29=12 2/29
18+х-2 27/29=12 2/29
х=12 2/29+2 27/29-18
х=15+18
х=-3
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Пошаговое объяснение:
14-7 21/29+х+4 23/29=12 2/29
14+4+х-6 50/29+4 23/29=12 2/29
18+х-2 27/29=12 2/29
х=12 2/29+2 27/29-18
х=15+18
х=-3