y=90-(90-y/4)/4

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Solution for y=90-(90-y/4)/4 equation:


y in (-oo:+oo)

y = 90-((90-(y/4))/4) // - 90-((90-(y/4))/4)

(90-(y/4))/4+y-90 = 0

(90-1/4*y)/4+y-90 = 0

(90-1/4*y)/4+(4*y)/4+(-90*4)/4 = 0

4*y-1/4*y-90*4+90 = 0

15/4*y-360+90 = 0

15/4*y-270 = 0

(15/4*y-270)/4 = 0

(15/4*y-270)/4 = 0 // * 4

15/4*y-270 = 0

15/4*y-270 = 0 // + 270

15/4*y = 270 // : 15/4

y = 270/15/4

y = 72

y = 72

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