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BACOENG Professional Vacuum Pump & Manifold Gauge Set - HVAC A/C Refrigeration Kit - Diagnostic R12 R22
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geometry - In $\triangle ABC$ with $AB=AC$ and $\angle BAC=20^\circ$, $D$ is on $AC$, with $BC=AD$. Find $\angle DBC$. Where's my error? - Mathematics Stack Exchange
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