Ответ:
1) 7х - 13 = -1
7х= -1 + 13
7х= 12
х=12/7
х= 1 5/7
2) 7х - 13 = 8
7х = 8 + 13
7х= 21
х= 3
3) 7х - 13 = 15
7х = 15+ 13
7х= 28
х=4
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Ответ:
1) 7х - 13 = -1
7х= -1 + 13
7х= 12
х=12/7
х= 1 5/7
2) 7х - 13 = 8
7х = 8 + 13
7х= 21
х= 3
3) 7х - 13 = 15
7х = 15+ 13
7х= 28
х=4