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Hey could you help me out with this question I have been stuck in this question

Hey could you help me out with this question I have been stuck in this question-example-1
User TavoGLC
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\begin{gathered} \text{triangle sum theorem says:} \\ \angle1+\angle2+\angle3=180 \end{gathered}
\begin{gathered} \text{definition of supplementary angles:} \\ \angle3+\angle4=180 \end{gathered}
\begin{gathered} \text{can you se}e\text{ my message ?} \\ \text{its uploading} \end{gathered}
\begin{gathered} \text{substraction property of equality} \\ \angle1+\angle2=\angle m4 \end{gathered}

User Rgoldfinger
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