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