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y in (-oo:+oo)
(-5*y)/4+4/4-5 = (12*y)/6-(4/6) // - (12*y)/6-(4/6)
(-5*y)/4-((12*y)/6)+4/4+4/6-5 = 0
(-5*y)/4-2*y+4/4+4/6-5 = 0
-13/4*y-10/3 = 0 // + 10/3
-13/4*y = 10/3 // : -13/4
y = 10/3/(-13/4)
y = -40/39
y = -40/39
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