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y in (-oo:+oo)
4*y-2 = 1/2 // - 1/2
4*y-(1/2)-2 = 0
4*y-1/2-2 = 0
4*y-5/2 = 0 // + 5/2
4*y = 5/2 // : 4
y = 5/2/4
y = 5/8
y = 5/8
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