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y in (-oo:+oo)
(4/9)*y-y+1/2 = (1/54)*(y-6) // - (1/54)*(y-6)
(4/9)*y-((1/54)*(y-6))-y+1/2 = 0
(-1/54)*(y-6)+(4/9)*y-y+1/2 = 0
(4*y)/9-1/54*(y-6)-y+1/2 = 0
(-1/54*2*9*(y-6))/(2*9)+(2*4*y)/(2*9)+(2*9*(-y))/(2*9)+(1*9)/(2*9) = 0
2*4*y-1/54*2*9*(y-6)+2*9*(-y)+1*9 = 0
23/3*y-18*y+2+9 = 0
2-31/3*y+9 = 0
11-31/3*y = 0
(11-31/3*y)/(2*9) = 0
(11-31/3*y)/(2*9) = 0 // * 2*9
11-31/3*y = 0
11-31/3*y = 0 // - 11
-31/3*y = -11 // : -31/3
y = -11/(-31/3)
y = 33/31
y = 33/31
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