SOLUTION: 3d+8=2d-7
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Question 1056287: 3d+8=2d-7
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
3d-2d=-7-8
d=-15
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a^2+3ad+2d^2=15,
2a+ 3d=8
Two possible progressions
a = 1, d = 2
1,3,5,7
or
a = 7,... (answered by greenestamps)