∠AEC = ∠ABD ⇒ ∠180 - ∠AEC = ∠180 - ∠ABD ⇒ ∠CBD = ∠ DEC
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∠AEC = ∠ABD ⇒ ∠180 - ∠AEC = ∠180 - ∠ABD ⇒ ∠CBD = ∠ DEC