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y in (-oo:+oo)
(3*y+12)/3+y = 6 // - 6
(3*y+12)/3+y-6 = 0
(3*y+12)/3+(3*y)/3+(-6*3)/3 = 0
3*y+3*y-6*3+12 = 0
6*y-18+12 = 0
6*y-6 = 0
(6*y-6)/3 = 0
(6*y-6)/3 = 0 // * 3
6*y-6 = 0
6*y-6 = 0 // + 6
6*y = 6 // : 6
y = 6/6
y = 1
y = 1
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