1 Answer

Antonella · Answer 1 · 2019-02-18T22:42:11+0000

If two lines are parallel and a transversal passes through them , then alternate interior angles are equal.

So here we have

3x+15=5x-5

5x-3x=15+5

2x=20

x=20/2=10

so option A . 10 is correct

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