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y in (-oo:+oo)
(1/2)*(y-2)+4 = (5/6)*(6*y-18) // - (5/6)*(6*y-18)
(1/2)*(y-2)-((5/6)*(6*y-18))+4 = 0
(1/2)*(y-2)+(-5/6)*(6*y-18)+4 = 0
1/2*(y-2)-5/6*(6*y-18)+4 = 0
1/2*(y-2)-5/6*(6*y-18)+4 = 0
4-9/2*y+14 = 0
18-9/2*y = 0
18-9/2*y = 0
18-9/2*y = 0 // - 18
-9/2*y = -18 // : -9/2
y = -18/(-9/2)
y = 4
y = 4
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