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y in (-oo:+oo)
(9*y-8)/4 = (13*y-8)/8 // - (13*y-8)/8
(9*y-8)/4-((13*y-8)/8) = 0
(9*y-8)/4+(-1*(13*y-8))/8 = 0
(8*(9*y-8))/(4*8)+(-1*4*(13*y-8))/(4*8) = 0
8*(9*y-8)-1*4*(13*y-8) = 0
20*y-32 = 0
(20*y-32)/(4*8) = 0
(20*y-32)/(4*8) = 0 // * 4*8
20*y-32 = 0
20*y-32 = 0 // + 32
20*y = 32 // : 20
y = 32/20
y = 8/5
y = 8/5
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