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y in (-oo:+oo)
6*(-y-3) = (1/3)*(9-(12*y)) // - (1/3)*(9-(12*y))
6*(-y-3)-((1/3)*(9-(12*y))) = 0
6*(-y-3)+(-1/3)*(9-12*y) = 0
6*(-y-3)-1/3*(9-12*y) = 0
6*(-y-3)-1/3*(9-12*y) = 0
-2*y-21 = 0
-2*y-21 = 0
-2*y-21 = 0 // + 21
-2*y = 21 // : -2
y = 21/(-2)
y = -21/2
y = -21/2
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