Ответ:
258х+2х=780
260х=780
х=780:260
х=3
12х+108х=480
120х=480
х=480:120
х=4
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Ответ:
258х+2х=780
260х=780
х=780:260
х=3
12х+108х=480
120х=480
х=480:120
х=4