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y in (-oo:+oo)
y/3 = 12/8 // - 12/8
y/3-(12/8) = 0
y/3-3/2 = 0
1/3*y-3/2 = 0 // + 3/2
1/3*y = 3/2 // : 1/3
y = 3/2/1/3
y = 9/2
y = 9/2
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