Quing dynasty relationship to european trade?

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Porcelain trade in Qing China was an important trade during the late Ming dynasty and throughout the Qing dynasty. The porcelain that was traded reflected a transition of creative influences that altered the way porcelain looked but its high demand in Europe.

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In the 18th and early 19th centuries, under the Qing dynasty (1644-1912), China produced tea, silk, porcelain and other goods for European consumption on an unprecedented scale. Although Europe had always had an appetite for Eastern luxuries, two main factors facilitated the explosion of trade at this time

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4 copper and gold, the california gold rush is why im pretty sure.

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69