Find the Unknown $x=51^{\circ}$ B) $x=86^{\circ}$ C) $x=41^{\circ}$ D) $x=129^{\circ}$

Find the unknown.
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A) $x=51^{\circ}$
B) $x=86^{\circ}$
C) $x=41^{\circ}$
D) $x=129^{\circ}$