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y in (-oo:+oo)
(42*y)/6+(16*y)/8-(9/3) = 396/12 // - 396/12
(42*y)/6+(16*y)/8-(9/3)-(396/12) = 0
(42*y)/6+(16*y)/8-33-3 = 0
9*y-36 = 0 // + 36
9*y = 36 // : 9
y = 36/9
y = 4
y = 4
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