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d - 23.6 = 24.9 \\ d = 47.5 \\ d = 48.5 \\ d = 2.3

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d-23.6=24.9\qquad\text{add 23.6 to both sides}\\\\d+23.6-23.6=24.9+23.6\\\\\boxed{d=48.5}

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