Answer:
d = 10
Explanation:
50 + 2 ( 2 - d ) = 3 ( 1 + d ) + 1
50 + 4 - 2d = 3 + 3d + 1
54 - 2d = 4 + 3d
- 4 -4
50 - 2d = 3d
+2d +2d
50 = 5d
50/5
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