50+x+y =180. Geometry
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From your picture it seems like the triangle that u have drawn is an isosceles triangle .
so y = 50°
( angles opposite to the equal sides are equal)
so , x + y + 50° = 180°
x + 50° + 50° = 180°
x + 100° = 180°
x = 180° - 100°
x = 80°
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