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y in (-oo:+oo)
3*y-(1/2) = 4 // - 4
3*y-(1/2)-4 = 0
3*y-1/2-4 = 0
3*y-9/2 = 0 // + 9/2
3*y = 9/2 // : 3
y = 9/2/3
y = 3/2
y = 3/2
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