The Stamp Act was passed by the British Parliament on March 22, 1765. The new tax was imposed on all American colonists and required them to pay a tax on every piece of printed paper they used. Ship's papers, legal documents, licenses, newspapers, other publications, and even playing cards were taxed.
The Gold Rush populated areas with people that were not practicing slavery
Here's the solution,
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Sum of interior angles of a triangle measures 180°
So,
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=》

=》

=》

hence, the value of x = 30°