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Provide the missing statement and reason for the following proof

Provide the missing statement and reason for the following proof-example-1
User Memoizr
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We have several important things to keep in mind for this exercise

- By the opposite angles at the vertex, the angle - The

Therefore we can find "x" by equating the angle
\begin{gathered} 12x+15=11x+20 \\ 12x-11x=20-15 \\ x=5 \end{gathered}it is proved that x=5

User Nao
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