Ответ:
21-9х+14+14х=0
-9х+14х=-21-14
5х=-35
х=(-35):5
х=-7
5x=-21-14
5х=-35:5
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Ответ:
21-9х+14+14х=0
-9х+14х=-21-14
5х=-35
х=(-35):5
х=-7
Ответ:
21-9х+14+14х=0
5x=-21-14
5х=-35:5
х=-7