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y in (-oo:+oo)
(5/2)*y+5/2 = 2*y-4 // - 2*y-4
(5/2)*y-(2*y)+5/2+4 = 0
(5/2)*y-2*y+5/2+4 = 0
1/2*y+13/2 = 0 // - 13/2
1/2*y = -13/2 // : 1/2
y = -13/2/1/2
y = -13
y = -13
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