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y in (-oo:+oo)
(3/2)*(y+4) = (20-y)/2 // - (20-y)/2
(3/2)*(y+4)-((20-y)/2) = 0
3/2*(y+4)+(-1*(20-y))/2 = 0
(3/2*2*(y+4))/2+(-1*(20-y))/2 = 0
3/2*2*(y+4)-1*(20-y) = 0
4*y-8 = 0
(4*y-8)/2 = 0
(4*y-8)/2 = 0 // * 2
4*y-8 = 0
4*y-8 = 0 // + 8
4*y = 8 // : 4
y = 8/4
y = 2
y = 2
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