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y in (-oo:+oo)
(5/3)*(y+4) = 1/2-y // - 1/2-y
(5/3)*(y+4)+y-(1/2) = 0
(5/3)*(y+4)+y-1/2 = 0
5/3*(y+4)+y-1/2 = 0
(5/3*2*(y+4))/2+(2*y)/2-1/2 = 0
5/3*2*(y+4)+2*y-1 = 0
16/3*y-1+40/3 = 0
16/3*y+37/3 = 0
(16/3*y+37/3)/2 = 0
(16/3*y+37/3)/2 = 0 // * 2
16/3*y+37/3 = 0
16/3*y+37/3 = 0 // - 37/3
16/3*y = -37/3 // : 16/3
y = -37/3/16/3
y = -37/16
y = -37/16
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