y=90-(90-y/2)/2

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Solution for y=90-(90-y/2)/2 equation: 


y in (-oo:+oo)

y = 90-((90-(y/2))/2) // - 90-((90-(y/2))/2)

(90-(y/2))/2+y-90 = 0

(90-1/2*y)/2+y-90 = 0

(90-1/2*y)/2+(2*y)/2+(-90*2)/2 = 0

2*y-1/2*y-90*2+90 = 0

3/2*y-180+90 = 0

3/2*y-90 = 0

(3/2*y-90)/2 = 0

(3/2*y-90)/2 = 0 // * 2

3/2*y-90 = 0

3/2*y-90 = 0 // + 90

3/2*y = 90 // : 3/2

y = 90/3/2

y = 60

y = 60

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