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y in (-oo:+oo)
8*(y/2) = 4.5*(y-2) // - 4.5*(y-2)
8*(y/2)-(4.5*(y-2)) = 0
8*(y/2)-4.5*(y-2) = 0
4*y-4.5*(y-2) = 0
4*y-4.5*(y-2) = 0
9-0.5*y = 0
9-0.5*y = 0
9-0.5*y = 0 // - 9
-0.5*y = -9 // : -0.5
y = -9/(-0.5)
y = 18
y = 18
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