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y in (-oo:+oo)
(2/3)*(y+1/2) = (-2/3)*(y-5) // - (-2/3)*(y-5)
(2/3)*(y+1/2)-((-2/3)*(y-5)) = 0
(2/3)*(y+1/2)+(2/3)*(y-5) = 0
2/3*(y+1/2)+2/3*(y-5) = 0
2/3*(y+1/2)+2/3*(y-5) = 0
4/3*y-3 = 0
4/3*y-3 = 0
4/3*y-3 = 0 // + 3
4/3*y = 3 // : 4/3
y = 3/4/3
y = 9/4
y = 9/4
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