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y in (-oo:+oo)
(42*y)/6+(16*y)/6-(9/3) = 396/12 // - 396/12
(42*y)/6+(16*y)/6-(9/3)-(396/12) = 0
(42*y)/6+(16*y)/6-33-3 = 0
29/3*y-36 = 0 // + 36
29/3*y = 36 // : 29/3
y = 36/29/3
y = 108/29
y = 108/29
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