320+х=650
х=650-320
х=330
х+87=587
х=587-87
х=500
780+х=800
х=800-780
х=20
840-х=310
х=840-310
х=530
х-330=560
х=560+330
х=890
350-х=50
х=350-50
х=300
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320+х=650
х=650-320
х=330
х+87=587
х=587-87
х=500
780+х=800
х=800-780
х=20
840-х=310
х=840-310
х=530
х-330=560
х=560+330
х=890
350-х=50
х=350-50
х=300