At first you have to write the variables out which are

now you have to combine like terms


now you add these two variables and end up with answer of
Answer: During the Warring States Period, nobles stopped supporting the Zhou Dynasty (1046–221 BC), and Zhou's vassal states declared themselves independent from Zhou, becoming kingdoms or warring states. Chu became the biggest state. It controlled the southern third of the entire region of the Warring States.
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In Ecuador, Europeans control most of the the wealth.
Answer:
Mountains, mountain ranges
Explanation: