Answer:
(15+3d)/6 = c
2 1/2 + 1/2d = c (more simplified)
Explanation:
15 = -3(2c +d)
15 = -6c -3d
+3d +3d
15 +3d = -6c
/-6 /-6
2 1/2 + 1/2d = c
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