Ответ:
- 3(1 - 3d) - 12 = 12
-3+9d-12=12
9d-15=12
9d=12+15
9d=27
d=27/9
d=3
-3(1-3d)-12=12
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Ответ:
- 3(1 - 3d) - 12 = 12
-3+9d-12=12
9d-15=12
9d=12+15
9d=27
d=27/9
d=3
Ответ:
-3(1-3d)-12=12
-3+9d-12=12
9d=27
d=3