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y in (-oo:+oo)
5/3 = (y-4)/4 // - (y-4)/4
5/3-((y-4)/4) = 0
(-1*(y-4))/4+5/3 = 0
(-1*3*(y-4))/(3*4)+(4*5)/(3*4) = 0
4*5-1*3*(y-4) = 0
32-3*y = 0
(32-3*y)/(3*4) = 0
(32-3*y)/(3*4) = 0 // * 3*4
32-3*y = 0
32-3*y = 0 // - 32
-3*y = -32 // : -3
y = -32/(-3)
y = 32/3
y = 32/3
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