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How to solve it? what are the steps I have to take to solve it?

How to solve it? what are the steps I have to take to solve it?-example-1

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The two triangles are similar. The proportion of the two sides therefore are the same. So 6:5 is the same as 20:6+x. You can calculate the 6+x side based on this and the last step is to simply subtract 6 from the side.
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