Ответ:
1.3х-8х=5+4
-5х=9
х=-5/9
2.-54+30х=9х+9
30х-9х=9+54
21х=63
х=21/63
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Ответ:
1.3х-8х=5+4
-5х=9
х=-5/9
2.-54+30х=9х+9
30х-9х=9+54
21х=63
х=21/63