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y in (-oo:+oo)
(5*(y-4))/2 = -4*y // + -4*y
(5*(y-4))/2-(-4*y) = 0
(5*(y-4))/2+4*y = 0
(5*(y-4))/2+(2*4*y)/2 = 0
5*(y-4)+2*4*y = 0
13*y-20 = 0
(13*y-20)/2 = 0
(13*y-20)/2 = 0 // * 2
13*y-20 = 0
13*y-20 = 0 // + 20
13*y = 20 // : 13
y = 20/13
y = 20/13
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