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Ответ дан
21fizika

1)

2у-14х+7=0

2у=14х-7

у=(14х-7)/2    ИЛИ    у=7х-3,5 (1)

2)

при х=-3   у=-21-3,5=-24,5  подставили х=-3 в (1)

при х=7     у=49-3,5=45,5.   подставили х=7 в (1).

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