а7=а1+6d
a3=a1+2d⇒a1+6d+a1+2d=-8⇒2a1+8d=-8⇒a1+4d=-4
a8=a1+7d
a5=a1+4d⇒a1+7d-a1-4d=-6⇒3d=-6⇒d=-2
a1+4d=-4
a1-8=-4⇒a1=4
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а7=а1+6d
a3=a1+2d⇒a1+6d+a1+2d=-8⇒2a1+8d=-8⇒a1+4d=-4
a8=a1+7d
a5=a1+4d⇒a1+7d-a1-4d=-6⇒3d=-6⇒d=-2
a1+4d=-4
a1-8=-4⇒a1=4