Решите уравнения :
450-х=60*7 и 480 : х = 100 : 10
450-х=60*7
450-х=420
450-420=х
х=30
480/х=100/10
480/х=10
480/10=х
х=48
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450-х=60*7
450-х=420
450-420=х
х=30
480/х=100/10
480/х=10
480/10=х
х=48