Answer :

We have the following:

[tex]\begin{gathered} 12x-1-53=9x-15 \\ 12x-9x=1+53-15 \\ 3x=39 \\ x=\frac{39}{3}=13 \end{gathered}[/tex]

therefore:

RST:

[tex]12\cdot13-1=155[/tex]

therefore RST is 155°

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