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y in (-oo:+oo)
((2*y+1)*(y-6))/3-((5*(y-6))/1) = (1/3)*(y-6) // - (1/3)*(y-6)
((2*y+1)*(y-6))/3-((5*(y-6))/1)-((1/3)*(y-6)) = 0
((2*y+1)*(y-6))/3-5*(y-6)+(-1/3)*(y-6) = 0
((2*y+1)*(y-6))/3-5*(y-6)-1/3*(y-6) = 0
((2*y+1)*(y-6))/3+(-5*3*(y-6))/3+(-1/3*3*(y-6))/3 = 0
(2*y+1)*(y-6)-5*3*(y-6)-1/3*3*(y-6) = 0
2*y^2-26*y-y+6+84 = 0
2*y^2-27*y+90 = 0
2*y^2-27*y+90 = 0
2*y^2-27*y+90 = 0
DELTA = (-27)^2-(2*4*90)
DELTA = 9
DELTA > 0
y = (9^(1/2)+27)/(2*2) or y = (27-9^(1/2))/(2*2)
y = 15/2 or y = 6
(y-6)*(y-15/2) = 0
((y-6)*(y-15/2))/3 = 0
((y-6)*(y-15/2))/3 = 0 // * 3
(y-6)*(y-15/2) = 0
( y-15/2 )
y-15/2 = 0 // + 15/2
y = 15/2
( y-6 )
y-6 = 0 // + 6
y = 6
y in { 15/2, 6 }
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