Y cannot be 0 because division by by 0 is undefined
The answer would be -5 1/4
If you are adding all the angles, then it equals 180 degrees.
If you are looking for the missing angle out of 360.. then it is 180
You need to multiply both sides of the equation by the reciprocal of 3/4. The reciprocal is 4/3 and 4/3 multiplied by 9 = 12. So x = 12 because a number times the reciprocal is one.