geometry - Finding angles of triangles - Mathematics Stack Exchange

I have what appears to be a $3$-sided triangle: it is two lines on a 180 degree line at the bottom. The bottom left angle is $4x-3$ the top angle is $6x + 3$ and the bottom right angle is not given

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geometry - Finding angles of triangles - Mathematics Stack Exchange

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geometry - Find missing angle in triangle - Mathematics Stack Exchange

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