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y in (-oo:+oo)
y/2 = 12/4 // - 12/4
y/2-(12/4) = 0
y/2-3 = 0
1/2*y-3 = 0 // + 3
1/2*y = 3 // : 1/2
y = 3/1/2
y = 6
y = 6
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