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y in (-oo:+oo)
(y+3)/2-((2*y-9)/8) = (5*y+3)/4 // - (5*y+3)/4
(y+3)/2-((2*y-9)/8)-((5*y+3)/4) = 0
(y+3)/2+(-1*(2*y-9))/8+(-1*(5*y+3))/4 = 0
(4*8*(y+3))/(2*4*8)+(-1*2*4*(2*y-9))/(2*4*8)+(-1*2*8*(5*y+3))/(2*4*8) = 0
4*8*(y+3)-1*2*4*(2*y-9)-1*2*8*(5*y+3) = 0
16*y-80*y-48+168 = 0
120-64*y = 0
(120-64*y)/(2*4*8) = 0
(120-64*y)/(2*4*8) = 0 // * 2*4*8
120-64*y = 0
120-64*y = 0 // - 120
-64*y = -120 // : -64
y = -120/(-64)
y = 15/8
y = 15/8
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