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y in (-oo:+oo)
y-1 = 4*y-(2/3) // - 4*y-(2/3)
y-(4*y)+2/3-1 = 0
y-4*y+2/3-1 = 0
-3*y-1/3 = 0 // + 1/3
-3*y = 1/3 // : -3
y = 1/3/(-3)
y = -1/9
y = -1/9
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