Question

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Answer 1

$3x - 5 + x + 20 + 65 = 180$

$4x + 80 = 180$

$4x = 180 - 80$

$4x = 100$

$x = \frac{100}{4}$

$x = 25$

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Answer 2

Explanation:

We know that the sum of all the angles joining at the same vertex on a line is equal to 180°, it is also known as a linear pair.

According to the above given explanation and the question,

3x - 5° + x + 20° + 65° = 180°

By simplifying the like terms, we get

4x + 80° = 180°

By transposition method, we get

4x = 180° - 80° = 100°

or, x = 100° / 4 = 25°

Answer:

The value of x is 25° .