Question

Need formula and answers

Answer 1

The top angle (10x+10) is equal to the angle below the lowest line and the skewed line. However, the 4x+2 is on the other side. But both together add up to 180° (a straight line).

So 10x+10 = 180-(4x+2) is the formula you're looking for.

Solving it:

10x+10 = 180-(4x+2) =>
10x+10 = 178-4x =>
14x = 168 =>
x = 12

Look up the theory for F angles and Z angles.