ABCD is a cyclic quadrilateral such that ∠A=( 4y+20 )°,  ∠B=( 3y−5 )°,  ∠C=( −4x)° and ∠D=( -7x+5 )° . Find the four angles.

Explanation

To find the angles of the cyclic quadrilateral ABCD, we will follow these steps:

### Step 1: Set up the equations based on the given angles.
Given:
- \( \angle A = (4y + 20)^\circ \)
- \( \angle B = (3y - 5)^\circ \)
- \( \angle C = (-4x)^\circ \)
- \( \angle D = (-7x + 5)^\circ \)
...