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y in (-oo:+oo)
(1/4)*(y+6) = 2*y-(3*(y-3)) // - 2*y-(3*(y-3))
(1/4)*(y+6)+3*(y-3)-(2*y) = 0
(1/4)*(y+6)+3*(y-3)-2*y = 0
1/4*(y+6)+3*(y-3)-2*y = 0
1/4*(y+6)+3*(y-3)-2*y = 0
13/4*y-2*y-15/2 = 0
5/4*y-15/2 = 0
5/4*y-15/2 = 0
5/4*y-15/2 = 0 // + 15/2
5/4*y = 15/2 // : 5/4
y = 15/2/5/4
y = 6
y = 6
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