Question 212853
x+y=90 or x=90-y
x+y=x-y+86 
(90-y)+y=(90-y)-y+86
90-y+y=90-y-y+86
2y=86
y=86/2
y=43 degrees.
x+43=90
x=90-43
x=47 degrees.
43-47+86=90
4+86=90
90=90