what is the difference of an ap in which a2-a7=84
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A2- A7 = 84
A+ d -(a+6d) = 84
A+d-a-6d = 84
-5d = 84
D = -84/5
A+ d -(a+6d) = 84
A+d-a-6d = 84
-5d = 84
D = -84/5
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