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y in (-oo:+oo)
(2/3)*y-y+2/3 = (1/18)*(y-2) // - (1/18)*(y-2)
(2/3)*y-((1/18)*(y-2))-y+2/3 = 0
(-1/18)*(y-2)+(2/3)*y-y+2/3 = 0
(2*y)/3-1/18*(y-2)-y+2/3 = 0
(-1/18*3*(y-2))/3+(2*y)/3+(3*(-y))/3+2/3 = 0
2*y-1/18*3*(y-2)+3*(-y)+2 = 0
11/6*y-3*y+1/3+2 = 0
1/3-7/6*y+2 = 0
7/3-7/6*y = 0
(7/3-7/6*y)/3 = 0
(7/3-7/6*y)/3 = 0 // * 3
7/3-7/6*y = 0
7/3-7/6*y = 0 // - 7/3
-7/6*y = -7/3 // : -7/6
y = -7/3/(-7/6)
y = 2
y = 2
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