The values of x, y, and z. The diagram is not to scale.
This is further explained below.
Generally, Angle in a triangle is 180^{\circ}
Therefore
45+68+x=180
x=180-(45+68)
x=67
The angle on a line is also 180^{\circ}
x+z =180
67+z =180
z =180-67
z =113
In conclusion
180=113+12+y
-180-(113+12)=y
y=55
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