а1+4d+a1+7d-15=a1+6d+a1+9d
2a1+11d-15=2a1+15d
4d=-15
d=-3,75
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а1+4d+a1+7d-15=a1+6d+a1+9d
2a1+11d-15=2a1+15d
4d=-15
d=-3,75