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y in (-oo:+oo)
(1/3)*(y-3)+4 = (5/6)*(3*y-12) // - (5/6)*(3*y-12)
(1/3)*(y-3)-((5/6)*(3*y-12))+4 = 0
(1/3)*(y-3)+(-5/6)*(3*y-12)+4 = 0
1/3*(y-3)-5/6*(3*y-12)+4 = 0
1/3*(y-3)-5/6*(3*y-12)+4 = 0
4-13/6*y+9 = 0
13-13/6*y = 0
13-13/6*y = 0
13-13/6*y = 0 // - 13
-13/6*y = -13 // : -13/6
y = -13/(-13/6)
y = 6
y = 6
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