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y in (-oo:+oo)
(3/2)*(y+4) = 20-(y/2) // - 20-(y/2)
(3/2)*(y+4)+y/2-20 = 0
3/2*(y+4)+y/2-20 = 0
(3/2*2*(y+4))/2+y/2+(-20*2)/2 = 0
3/2*2*(y+4)+y-20*2 = 0
4*y-40+12 = 0
4*y-28 = 0
(4*y-28)/2 = 0
(4*y-28)/2 = 0 // * 2
4*y-28 = 0
4*y-28 = 0 // + 28
4*y = 28 // : 4
y = 28/4
y = 7
y = 7
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