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y in (-oo:+oo)
3*y+6/4 = 12 // - 12
3*y+6/4-12 = 0
3*y-21/2 = 0 // + 21/2
3*y = 21/2 // : 3
y = 21/2/3
y = 7/2
y = 7/2
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