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5-((8-y)/2) = -y // + y
y-((8-y)/2)+5 = 0
(-1*(8-y))/2+y+5 = 0
(-1*(8-y))/2+(2*y)/2+(2*5)/2 = 0
2*y-1*(8-y)+2*5 = 0
3*y-8+10 = 0
3*y+2 = 0
(3*y+2)/2 = 0
(3*y+2)/2 = 0 // * 2
3*y+2 = 0
3*y+2 = 0 // - 2
3*y = -2 // : 3
y = -2/3
y = -2/3
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