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Zoti · Answer 1 · 2019-01-24T10:33:15+0000

notice y° and y° and 50°, are all three angles in a flat-line, namely "linear angles", and since a flat-line is always 180°.

$\bf y+y+50=180\implies 2y=180-50\implies 2y=130 \\\\\\ y=\cfrac{130}{2}\implies y=65$

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