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y in (-oo:+oo)
(2/3)*(y+8) = (4/9)*(y+6) // - (4/9)*(y+6)
(2/3)*(y+8)-((4/9)*(y+6)) = 0
(2/3)*(y+8)+(-4/9)*(y+6) = 0
2/3*(y+8)-4/9*(y+6) = 0
2/3*(y+8)-4/9*(y+6) = 0
2/9*y+8/3 = 0
2/9*y+8/3 = 0
2/9*y+8/3 = 0 // - 8/3
2/9*y = -8/3 // : 2/9
y = -8/3/2/9
y = -12
y = -12
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