# (14x-13)(4x+13)(6x+2)

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**Answer:**

As the external angle is (14x-13)

**Step-by-step explanation:**

the internal anngle+ external =180

So,6x+2+4x+13+ {180-(14x-13)}=180

10x+15+180-14x+13=180

-4x=-28

x=28/4=6.5

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