Given: 

Find: 

(See the figure for Exercise 6.) 
To find:
Given:
Theorem used:
When three (or more) parallel lines are cut by a pair of transversals, the transversals are divided proportionally by the parallel lines.
NumeratorDenominator addition property:
If
Calculation:
Given:
Since when three (or more) parallel lines are cut by a pair of transversals, the transversals are divided proportionally by the parallel lines.
Also given that
Thus
We know that, if
From the figure, we see that
Given that
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