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Answer:
d = -1/16
Explanation:
explained it step by step in the comment section
-10 = -2 + 1/2d
-10 = -4d + 1 / 2d
-20d = -4d + 1
-20d + 4d = 1
-16d = 1
d = -16
-20 = -4 + d
-16 = d
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